Hi All,
Read Ch 4 Universal Gravitation ONLINE Assignment: Johannes Kepler and Planetary Motion Animation Interact with the simulation and write a three paragraph critical reflection about what you found and post to the blog http://galileoandeinstein.physics.virginia.edu/more_stuff/flashlets/kepler6.htm We will talk about momentum and gravitation in more detail and do an activity.
QUESTION 5: What is the difference between mass and weight? Be specific and give examples.
Have a great week,
Dr. E
On Tuesday we didn’t have class we had to do a lab take home lab that involved motion with planets. The lab seems to be like the game of asteroids but you soon realize what the significance of this website. Motion is clearly shown in this lab; Motion is the change of location or position of an object. A change in motion is the result of an applied force.
ReplyDeleteThe lab used the earth as a way to show motion, you could click anywhere on the boundaries and you can see the gravitational pull the sun has on the earth. If you click on the black boundary the earth starts to move toward the sun, the earth picks up speed as it closer to the sun. Before the sun and earth hit it reaches it max potential of speed and then there is an explosion. Direct correlation is used with the further you are away the sun speed and also time increase.
I also made the earth rotate around the sun. The motion of the earth increased the closer you got to the sun. The distance of the sun was 99 x10^6km with the speed fluctuating from 29-210 km/sec, you can see how motion is used and also how gravitational pull is used to. I liked this activity it shows you how motion increases when the distance gets closer to the sun. This lab showed a lot on how gravitational pull effects the speed of an object.
On Thursday we took a couple of notes on momentum we did a couple of equations with momentum which was m=mass x velocity. Another equation we worked with our notes was impulse motion=F x change in time. In class we talked about force to and if we would rather hit a haystack wall or a wall of bricks. The reason why you want to hit hay is because the momentum of hitting the stack disperses because hay weighs less. We also did two labs that dealt with motion, the first a lab that dealt with the suns gravity. The lab was tying a ball at the end of the string and rotating the ball over your head with an axis in the center. During the lab we had to add more gravity by adding more pressure on the string below the spool. For the second lab we found out how rockets work. This lab was fun we put string threw a straw and then blew up a sausage shaped balloon and taped up the balloon to the straw and released the balloon and watch the balloon fly up the 2 meters of string we had. The rocket worked because the pressure from the balloon was more than the present air which moved the balloon up on the sting. The rocket works because for every action there is an opposite or equal reaction. So the when the rocket pushes air out of the chamber the gases push back which then entitles the rocket to propel.
The difference between mass and weight?
Mass is a measurement of the amount of matter something contains, while Weight is the measurement of the pull of gravity on an object. Mass is measured by using a balance comparing a known amount of matter to an unknown amount of matter. Weight is measured on a scale. The Mass of an object doesn't change when an object's location changes. Weight, on the other hand does change with location. An object such as a basketball has the same mass but if one has water in it instead of air the weight changes but mass still stays the same. Another example would be two cars traveling down the road both being the same size, shape and weight if parked. But if someone gets in the car and the other car is still parked the weight has changed, but not the mass of the car.
The difference between mass and weight.
ReplyDeleteMass is the quantity of matter in an object, whereas weight is the force due to gravity on an object. An object will have the same amount of mass where ever it will go. An objects weight could fluctuate when it is at a different setting. If on the moon for example, a bowling ball will have the same amount a mass as it would on earth, but the weight of the bowling ball will be dramatically different.
Tuesday
On Tuesday we didn't have class. On of the things that we were supposed to look at was a website where we were to experiment with Kepler's Laws.
Kepler's Laws give an approximate description of the motion of the planets around the sun. Kepler's laws are: the orbit of every planet is an ellipse with the Sun at a focus; a line joining a planet and the sun sweeps out equal areas during equal intervals of time; and the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
In this website we were allowed to take a planet and place it in different positions with different angles and see how it will react to the sun. I did one experiment where I started the planet at a distance of 195 X 10^6 km to the sun. Being able to play with the different angles and the different speeds of the planet was interesting. This would be helpful and interesting in a elementary classroom because it would give students a hands on chance to interact with planets in relation to the sun.
Thursday
In class we did a project that allowed us to experiment with momentum and how force can impact an object. Our group did an experiment where we tied a balloon to a straw that was already connected to a piece of string that was angled in an upward direction. The balloon was filled up with air and then let go in order to show the force/ pressure in the balloon would shoot the straw and balloon upward on the string. This was successful because the force from the air that was being let out of the balloon gave the straw enough momentum to go upward on the string, therefore defying the direction gravity wanted to pull it.
On Tuesday, we did not have class but we had to do a lab on line about planets. The lab put strong emphasis on motion and what it does with an applied force. While motion is the change of position of an object, and applied force is the change in motion being acted out. This was a very fun lab and interesting to look at when everything in the solar system can be moved around in it.
ReplyDeleteThe lab had a strong lesson about motion and the applied motion that goes along with it. First to do a couple test runs you could click anywhere on the black screen to see that it would be pulled to the sun. This was fun to see how the speed and time would increase directly with eachother, until the earth hit the sun and they both stopped increasing. Differnt distances made the speed increase slower than up close.
When I started taking data, I used 420 x 10^6 km from the sun. When the earth finally hit the sun the speed was 117 km/sec and the time was 332 days. The speed started out really slow but kept increasing slowly and then faster as it got more momentum.
The second amount I used was 58 X 10^6 km from the sun. When the earth collided with the sun, the time was 9 days and the speed was 39 km/sec. With such a short distance to move, it did not pick up as much momentum as the first one did.
The third and final amount I used was 202 x 10^6 km from the sun. When the earth collided with the sun, the time was 108 days and the speed was 77 km/sec. This one gained more momentum then the last example but less than the first since the distance was shorter. This was a fun activity that could be used to show kids the pull.
Thursday in class, we did two labs in class. The first one we did, we tied a ball to a string and held a spool at the other end. Then, we spun the ball around at differnt tensions in the string. It was very interesting to see how it effected it. The second lab we did was by taping a blown up balloon to a string with a straw and saw how far it would go. It was interesting to see how far the balloon would go before it ran out of air. Both of these labs were very good examples of explaining motion.
Difference between mass and weight
Mass is the measure of the amount of matter an object contains. Weight is the measurement of the gravitational pull on an object. Mass and weight are differnt because no matter what the atmosphere, mass will not change but weight will. One example of this is objects on the moon. They weigh one weight on Earth and less on the moon, but this object has the same mass both places.
Tuesday
ReplyDeleteSince we did not have class on Tuesday of this week, we were intructed to do a take home lab involving Kepler's laws of planetary motion. Kepler's laws are: 1. The orbit of every planet is an ellipse with the Sun at a focus. 2. A line joining a planet and the Sun sweeps out equal areas during equal intervels of time. 3. The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. (This information is from Wikipedia).
The lab showed a sun, a planet, and a table with a lot of numbers and information. When I first started exerimenting with the program, it took me awhile to figure out how to get the planet to orbit around the sun. I kept exploding the sun! But then I looked at the numbers below that showed the information about the orbits of actual planets in our solar system. It was a great way to put the numbers to the test and to see that they actually meant.
Thursday:
On Thursday, we did a lab involving momentum and force. The first part of the lab, we tied a ball to the end of a string and put the string through a spool. While holding the spool, we then spun the ball around and counted how many orbits it had in 15 seconds. When then counted to orbits in 15 seconds while holding the string at different lengths. In the second part of the lab, we tied a balloon that we blew up to a straw and put a string through that straw. We taped one end of the string to the wall and the other end to the bottme of the stair railing and put the straw at the bottom of the angle. When we let go of the balloon so that the air could escape, the balloon/straw shot upward on the string. This happened because the force from the air escaping the balloon caused enough momentum for it to defy gravity and shoot upward.
What is the different between mass and weight?
Mass is the amount of stuff, or the amount of the matter, contained in an object. Weight, on the other hand, is the measure of the gravitational pull of an object. Mass will not change when the atmosphere changes because it is constant. A ping pong ball on Earth will take up the same amoung of space on the moon. However, a ping pong ball on Earth will not weight the same on the moon because the amoung of gravitational pull is going to be different. Mass and weight are different because mass is constant, no matter what kind of atmosphere, but weight is dependent on the atmosphere.
We didn't have class on Tuesday so our assignment was to work with the website provided for us dealing with Kepler's Laws. Kepler's Laws are 1)The law of orbit: that all planets move in eliptical orbits with the sun as the focus. 2) Laws of area: a line that connects a planet to the sun sweeps out equal areas in equal times. 3) Laws of periods: the square of the period of any planet is proportional to the cube of the semimajor of its orbit. (found on http://hyperphysics.phy-astr.gsu.edu/HBASE/Kepler.html) The activity on our given website allowed us to make our own orbits of the planets around the sun. I didn't get this activity at first, it took me awhile to figure out what we were supposed to be doing, but once I figured it out it was fun to play around making different orbits.
ReplyDeleteThursday in class we reviewed momentum and then did two activities dealing with force and momentum. The first lab we had to thread a string through a ball and through a spool and spin it around in an orbit counting the times it would orbit in 15 seconds. The second activity was to tape a balloon around a straw that was threaded through a straw. When we let go of the balloon the air forced the balloon up the string showing the force and momentum showing the defiance of gravity.
The difference between mass and weight is mass is the quantity of matter in an object. Weight is the force due to gravity on an object,
Tuesday:
ReplyDeleteWe didn't have class Tuesday but had a take-home lab to do. In the lab we had to situate the Earth a different distances from the sun. I didn't get the lab at first but I soon realized that the closer the Earth got to the Sun the faster it went.
Thursday:
In class we reviewd motion. We did two labs focusing on force and momentum. In our first lab we put a string through a ball and a spool and spun in around un in an orbit for 15 seconds. Our second lab we taped a balloon to a string through a straw and let go of the air. It was interesting to see how far the balloon would go. This demonstrated force and momentum both.
What is the difference between mass and weight?
Mass is the measure of interia or slugishness that an object exhibits in response to any effort made to start it, stop it, deflect it, or change its state of motion in any way.
Weight is the gravitational foce with which a body presses against a supporting surface.
Tuesday ONLINE ASSIGNMENT
ReplyDeleteOn Tuesday, Dr. E. was gone so we were assigned an online simulation about planetary motion and Kepler’s Law. The simulation consisted of a virtual universe in which I tried to get a planet to orbit the sun. I was able to set the initial velocity and direction in which the planet would start its orbit, but it was difficult to get the planet to do a full rotation.
The simulation was centered around Kepler’s Laws of planetary motion. The first law states that planets orbit in an elliptical motion with the sun as a focus. The second law explains that a line that joining a planet and the sun sweeps out equal areas in equal amounts of time. Kepler’s third law states that the ratio of the squares of planets’ revolutionary period is proportional to the cubes of their semimajor axes.
The simulation allowed to us to actually view Kepler’s Laws. It also asked to try to make a hyperbolic and elliptical orbit with the planet. The hyperbolic motion was much easier to make. The planet didn’t need to fully orbit the sun, just be affected by the sun’s gravitational pull, causing its path to bend. It took me quite a few tries to get the planet to revolve around the sun in an elliptical motion. The planet had to have a faster initial velocity and be closer to the sun than I originally thought.
Thursday
Today we started off class by taking some notes on momentum and impulse. Dr. E gave us some equations for each and showed us mathematically how impulse and momentum are related. Then we did two activities; the first was a project dealing with the gravity of the sun, where we made a planet (rubber ball) orbit the sun (sewing spool) using a string to connect them. The second project we did had to do with rocket momentum. We used a balloon as our rocket and taped it to a straw. The straw had a long piece of string running through it which was tied to the bottom of a railing and a higher point on a wall. When the air was let out of the balloon, it shot up the string as it deflated.
What is the difference between Mass and Weight?
Mass is the amount of matter in an object, while weight is the amount of gravitational pull with which an object is pressed against a surface. Weight is subject to change depending on the gravitational pull of the supporting surface, but mass is the same whether gravity is present or not. For example, a person would have the same mass on the moon as they do on the earth, but their weight would be much lighter on the moon.
Tuesday:
ReplyDeleteTuesday, February 16, we were to read Chapter four Universal Gravitation online. On the website, we interacted with the Johannes Kepler and Planetary Motion Animation. In this experiment, we could click anywhere on the applet to place our planet. We were then given set orbits such as the distance from the sun, the average speed, and length of year which we could use as our starting point.
To gain a better understanding of Kepler’s Laws, I researched what they consisted of on the internet. Kepler’s first law states that “the orbit of every planet is an ellipse with the Sun at a focus.” His second law states that “A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.” His final law concludes that “the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.”
At first, it was difficult to get the planet to orbit the sun. After trying to use the given speeds and distances from the Sun, I started to come up with my own. I placed the planet very close to the Sun in order to get it to orbit. After getting the planet to orbit the Sun in an elliptical shape, I then attempted to get a hyperbolic one as well. The hyperbolic shape was much easier to get to orbit the Sun because it did not need to fully orbit it, because the gravitational pull bent the planet’s path.
Thursday:
Thursday, February 18, we began class by studying momentum. As we went through the PowerPoint, we learned that if direction is not an important factor in determining the momentum, the formula is simply mass times the speed. We then discussed the importance of impulse and momentum and how they are related. If momentum changes, it is because the mass or velocity changes, resulting in the formula: I=FΔt; but, most often, mass does not change, so velocity changes (acceleration). Applying a force (mass times acceleration) over a time interval to an object changes the momentum. The formula that we would use for impulse then would be force times time interval. An important aspect to remember when studying momentum is that in order to increase momentum, one must apply the greatest force possible.
Class Activity:
We also did an activity today in which we explored the laws of motion. To begin our activity, we were to tie one end of the string tightly to the ball (representing the planet), sliding the other end through the hole of a sewing pool. One member of our group tested the experiment by whirling the planet above her head while holding the string tightly with her other hand. Within 15 seconds, we recorded that the planet circled the sun twenty-nine times. The second part of the experiment asked us to keep the string length the same as before, but now pulling harder on the string below the spool. The number of times the planet orbited the sun this time was forty. We concluded that the planets closest to the sun have less mass while the planets further out from the sun have more mass.
For the second part of class, we were to construct a rocket. We were to thread one end of a string through a straw and fasten that end low on a table leg (we used the railing on the staircase). The other end was to be fastened high on a wall. After blowing up the balloon, we folded the open end and fastened it with a paper clip. Holding the balloon near the floor end of the string, we quickly removed the paper clip as we watched the balloon slide up the string and deflate. The momentum of the air explains why this happens to the balloon.
What is the difference between Mass and Weight?
Mass is the amount of matter in an object while weight is the force of due to gravity on an object. An example that shows the difference between the two is a person standing on earth. Their mass will be the same on the earth and the moon but their weight will be much lighter on the moon due to the moon’s lack of gravitational pull.
Tuesday:
ReplyDeleteDr. E wasn't here on Tuesday, so we were given an online lab activity that delt with Kepler's laws. At first, I didn't understand it, but after playing around with it for awhile I was able figure some things out.
Thursday:
In class on Thursday we did two activities. In the first one, we tied a wooden ball and spool to a string. Then we spun it around for 15 secons and counted how many times it circled around. For the second activity, we tied a piece of string to a wall and then taped a straw to the bottom of it. We then attached a blown up balloon to the straw. As one person held the other side of the string up in the air, we let the balloon go and watched as it flew up the string.
Difference between mass and weight.
Mass is the amount of matter that an object contains and weight is the force acting on an object due to gravity. No matter where you are, the mass of an object will be the same. However, the weight of an object will change.
Tuesday:
ReplyDeleteOn Tuesday we did not have class. We were supposed to do an online assignment that dealt with Kepler's Law and planetary motion. We were given set orbits such as the average speed of our planet, the distance of our planet from the sun, and the length of the year for our starting point. I was not sure on what Kepler's Laws were, even after have done the online assignment so I looked them up on Google:
1. The Law of Orbits: All planets move in elliptical orbits, with the sun at one focus.
2. The Law of Areas: A line that connects a planet to the sun sweeps out equal areas in equal times.
3. The Law of Periods: The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.
After looking them up, I really had a much better understanding of what they were and found them very interesting.
Thursday
In class on Thursday we learned about momentum. We did two labs to better understand how force and momentum work. In the first lab we first was a project dealing with the gravity of the sun, where we made a planet (rubber ball) orbit the sun (sewing spool) using a string to connect them. It showed us more on planetary rotation. The second lab we did was my favorite this far in the semester. We went out into the hallway and taped one side of the 20 ft string to the wall and held the other end. Then we blew up the balloon and taped it onto the straw that was at the base of the string. It was really cool to see how fast the balloon shot forward once we let the air out. Out group experimented by getting longer string to see how that would affect it. Turns out we did not have enough air in the balloon to keep it going the length of the string.
Question:
Weight is the force due to gravity on an object and mass is the amount of matter in an object. One difference is that weight is subject to change depending on where they are, but mass stays the same.
Tuesday:
ReplyDeleteOn Tuesday we were asked to visit a site that showed Kepler's laws. Kepler's laws give an approximate description of the motion of planets around the sun. There are three different laws under Kepler's laws.
The first law states that the orbit of every planet is an ellipse with the sun at it's focus. The second law states a line joining a planet and the Sun sweeps out equal areas during equal intervals of time. The third law states the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
The site demonstrated the laws by allowing users to place a planet around a sun and the give the planet an initial velocity in a direction that the user sets. This helped me to understand the motion of planets in relation to the sun.
Thursday:
On Thursday we did two labs covering the topic of momentum. The first lab involved a spool, string, and rubber ball in order to demonstrate the gravity between the sun and a planet. The second lab involved us measuring out 20 feet of string, taping the string down to the floor, having the string go up, having a straw on the string, taping a balloon to the string, and the letting the air out of the balloon. The balloon would move up the string once air was released from it, demonstrating momentum. The experiment was a lot of fun.
Question:
Mass pertain to the matter in an object and weight is the force that gravitation exerts upon a body. Weight can change depending on where a person is, but mass is constant. If a person where to be on a different planet, that person's weight, but not mass, would change.
Tuesday:
ReplyDeleteWe did not have class because Dr. E could not be there, so we were given an online assignment. At first the I did not understand the lab at all because there were not very good directions, but after messing around with the planets for a while I started to understand the concept. I did alot of different trials and came to the conclusion that the farther from the sun the planets have to move slower because the speed increases as the planet moves in closer. I thought that the activity showed motin and the effect that enertia has on acceleration very well. As a student I next understood why that planets orbit in a oval instead of a cirlce, and now I have a tool I can use in my own classroom to demonstrate motion and gravitational pull.
The Law of Orbit: Every planet is an ellipse with the sun at it's focus.
The Law of Area: A line joining a planet and the Sun sweeps out equal to the areas during equal intervals of time.
The Law of Periods: the square of the orbital period of a the planet is directly proportional to the cube of the semi-major axis of the orbit.
Thursday:
On thursday we did two labs to demonstrate motion and force. Befoere we did our lab Dr. E explained Impulse and momentum. She gave the example that it is much better to run a car into a pile of hay than a wall. The impulse will be less because the momentum would be slowed down gradually rather that all momentum stoping at once.
Question:
Mass is the amount of matter an object has and weight is the amount of gravity exerted on an object depending on what planet the object is on. Mass is always constant, where as weight can vary depending the amount of gravity.
Tuesday:
ReplyDeleteOn Tuesday we did not have class, but had an online assignment about Kepler's Law of Planetary Motion.
Thursday:
I was not in class on Thursday. The class discussed momentum and did two lab activities to better understand momentum.
Difference between mass and weight:
Mass is the amount of matter in an object and weight is the force that gravity puts on an object. Weight can change depending on the force of gravity acting on the object; however, the mass of the object cannot change.
Tuesday:
ReplyDeleteWe did not have class Tuesday, but was asked to do a lab online. The assignment online was about Kepler's Law of Planetary Motion. The sun was in the middle of the screen and we had to place the other planet around the earth somewhere. As the planet got closer and and closer to the sun it started to move faster. This is due to the gravitational pull of the Sun. The further the planets are the slower the planet starts off at.
Thursday:
I was nt in class on Thursday. The class discussed momentum and then did two different labs.
Question:
Mass is the amount of matter in an object. The weight is the amount of force exerted on an object. Weight can changed depending on the force of gravity acting upon an object. Mass is different because it is always constant.
Class Activities:
ReplyDeleteTuesday we were assigned an online assignment involving a simulation on planetary motion and Kepler's Laws. The simulation involved a virtual universe where I tried to get a planet to orbit the sun. I was able to set the initial velocity and the direction of the planet each time. However, it was difficult to get the planet to complete a full rotation.
Kepler's Laws of planetary motion were the focus of the simulation. The firs says that planets orbit an elliptical motion with the sun as its center. The second law says that a line connecting a planet and the sun sets out equal areas in equal periods of time. The third law states the ratio of the squares of planets' revolutionary period is directly proportional to the cubes of the planets semi-major axis.
The simulation showed Kepler's Laws in action each time I tried completing an orbit. It also suggested to make an elliptical and hyperbolic orbit. The hyperbolic motion was easier to make. The planet did not need to orbit the sun fully, but just be influenced by its gravitational pull. The elliptical orbit was a bit harder because the planet had to have a faster initial velocity and be closer to the sun than the hyperbolic orbit.
On Thursday, we began by taking notes on the relationship between impulse and momentum. We looked at some examples of each, and saw in equation form how they are related. We also did two labs; the first involved looking at the gravit of the sun, where we made an orbit, using a ball for the planet and a spool for the sun, connected by a string. The second lab focused on momentum. We used a balloon as a rocket and taped it to a straw. The straw had a long piece of string running through it, one end was held to the floor, while we held the other end up above our heads. When we let go of the balloon it deflated and propelled itself up the string.
What is the difference between Mass and Weight?
Mass is the amount of matter in an object. Weight is the amount of gravitational pull an object has when pressed on a surface. Weight can change depending on the pull of the surface, but mass remains constanta at all times. This is illustrated when a person is on the moon, their mass will remain the same even though there is no gravity, however their weight will be much lighter than it was on Earth.
On Tuesday, we had an assignment online to work with a simulation about planetary motion and Kepler’s Law. The simulation had a virtual universe for me to try to get a planet to orbit around the sun. I set the initial velocity and direction the planet would start its orbit, but it as difficult because I could not always get the planet to do a full rotation.
ReplyDeleteThe simulation taught about motion through learning about Kepler's law's of planetary motion The first law says that planets orbit in an elliptical motion with the sun as a focus. The second law states that a line that joining a planet and the sun sweeps out equal areas in equal amounts of time. Kepler’s third law states that the ratio of the squares of planets’ revolutionary period is proportional to the cubes of their semimajor axes.
We go to view Keplers law through his simulation. I aso tried to make a hyperbolic and elliptical orbit with the planet. The hyperbolic motion was much easier i didnt have to make the planet fully orbit the sun. It was just affected by the sun’s gravitational pull, causing its path to bend. It was harder to do the elliptical motion and make the planet revolve around the sun. I didnt know the planet had to have that fast o an initial velocity and be closer to the sun.
On Thursday, we learnd about momentum and force. We were taught different equations dealing with both and also did a lab to demonstrate it. First, we put a string through a spool and tied a ball to the end then spun the ball around and counted how many orbits it made in 15 seconds. Then we counted the number of orbits in 15 seconds while holding the string at different lengths. After that we went in the hall and made a balloon rocket. We tied a balloon to a straw and put a string through that straw. We had one person hold one end of the string high and a different person held the other end by the floor. The rocket started at the bottom of the angle. When we let the air out of the balloon, the rockt shot upward on the string. This happened because the force from the air escaping the balloon caused enough momentum for it to defy gravity and shoot upward.
What is the difference between Mass and Weight?
Mass is the measure of the amount of matter an object contains. Weight is the measurement of the gravitational pull on an object. Weight may change depening on the atmosphere but mass does not. One example is an object will weigh less on the moon than it does on the earth but it stll has the same mass either place.
Tuesday
ReplyDeleteOn Tuesday we did not have class in the normal room, instead we had an online lab. This lab was about Kepler’s laws
Kepler’s law are: the orbit of every planet is an ellipse with the sun at a focus; a line joining a planet and the sun sweeps out equal areas during equal interval of time; and the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of the orbit. The site that we were described the motion of the planets around the sun. On the site we were about to play with the placement of the planet.
Thursday
In class we took some notes and then split up into groups to do a project. The first experiment was about a ball orbiting a spool. We had to try to do the experiment different and see if the time it would orbit would change. For my group that was not true because the length of the ball from the spool was not a great difference.
The difference between mass and weight
Mass is the measure of the amount of matter an object contains. Weight is the measure of the gravitational pull on an object. On the moon the mass would not change. On the other hand the weight would not be the same because there is not the same amount of gravitational force.
Tuesday:
ReplyDeleteOn Tuesday, class was cancelled but we still had to complete a lab online. The assignment for the day was a simulation of planetary motion and Kepler's laws. The website given to us was interacted. It demonstrated the orbits of planets around the sun.
In the lab, there were several settings that could be changed. These included initial velocity and the sun's gravitational pull. When you increased the sun's gravitational pull, the planet orbited the sun from a closer distance. Also, when the planets initial velocity was increased, the planet was closer to the sun.
Kepler's laws were demonstrated in the lab as well. Kepler's laws include three separate laws: a planet's orbit is elliptical around the sun as a focus; a line that connects a planet to the sun sweeps out equal areas in equal times; the square of the period of any planet is proportional to the cube of the semimajor axis of its orbit. To better understand the laws, I further explored the definitions. Kepler's laws describe the motion of planets around the sun.
Thursday:
In class on Thursday, we talked about momentum. We discussed the formula for momentum and we broke it down back into other basic formulas we've used. After, we did two labs that demonstrated planetary motion and momentum. The first lab showed that the closer the planets are to the sun, and the greater the sun's gravitational pull, the faster the planets are moving around the sun. The second lab included a balloon moving pushing a straw along a string. A greater weight and a slant in the string caused a faster moving straw, and therefore, greater momentum.
Question: What is the difference between mass and weight?
The mass of an object is constant at all times. However, weight is subject to change at different gravities. For example, a bowling ball on the earth is the same size and takes up the same amount of space as it does on the moon. However, because earth has a greater gravitational pull, the bowling ball would weigh more on the earth than it would on the moon. Weight is dependent partly on mass, but mass is constant.
Tuesday-
ReplyDeleteWe had class on-line. We did a stimulation on the internet about orbits around the sun. We set different speeds and distances to determine the different orbits and how far from the sun we orbited. Motion was the main concept of this lab, motion is the change of location of an object.
On the first orbit I was just getting the feel for it and put the ball 90 x 10^6 km with a distance of 60 and it ran into the sun. On the second trial I had a distance of 100 and speed of 122 x 10^6 km and it orbited around the way it should. It was interesting to see how it moves faster in some areas then in others.
Thursday-
In class we talked about momentum. We did 2 different labs. In the first lab we took a spool and put a string through the middle and a ball at the end of the string then twirled it around with different forces on the string. The labs were to better show us momentum and the different forces. In the second lab we took a straw and put a string though it then taped a balloon to the straw. We made the string go upwards and let the air out of the balloon so it would shot up the string. It taught us how much momentum makes a object move.
So sorry I am adding my blog late.
ReplyDeleteOn tuesday we had a simulation to experiment with instead of having class.
The simulation talked bout kepler's laws. I didn't know anything about Kepler's laws so i reasearched them. Kepler's laws include, the law of orbits, law of areas, and law of periods.
The Law of orbits says, all planets move in elliptical orbits, with the sun at one focus. I experimented with this law on the simulation and found the law to be true, when i sent the planet in the right direction. Alot the time though i would send the planet plumetting into the sun.
The law of areas states, a line that nennects a planet to the sun sweeps out equal areas in equal times. When the planet is closer to the sun, it moves faster, sweeping thtough a longer path in a given time. On the simulation I used the Kepler's law button and I experimented with this phenomenom. We don't have to discuss the law of periods because it didn't have much to do with the simulation.
The simulation was confusing at first. It took awhile to get the hang of, but after i researched Kepler's laws i further understood it. Although I still ran my planet into the sun. I also tryed to match other planets statistics with my planets and that was very difficult to do. I also could never make a circle, just ovals. The simulation was a learning experience and very interesting.
On Thursday we experimented with planetary motion and momentum. The string and spool lab was sort of confusing to me, maybe we could do a lab with a ball in a bucket and with the speed of moving the bucket the ball does not fall out. Is this the same concept?
What is the difference between mass and weight?
Mass is how much content is part of an object. It is constant in all places. Weight is how much gravitational pull the earth has on an object. Weight changes in different places such as the moon. A car has the same mass on the moon as it does on earth. A car has a dramatically different weight on the moon than on earth.
We didn’t have class on Tuesday, but we were expected to view Kepler’s Law and do some activities with it. Kepler’s Law describes the motion that the planets take when surrounding the sun. What was interesting about the website was the different kinds of things we were allowed to experiment with to enforce Kepler’s Law. For instance, we could take a planet and place it in many different positions to see what the reaction to the sun would be. I liked the different solutions that would come about from using different angles and speeds. I knew that they would have an effect, but it was cool to see them work together to illustrate Kepler’s law. It really helped me understand. One question I do have though is if speed and angle are the only factors that play a role in the relationship between the suns and planets?
ReplyDeleteIn class on Thursday, we did a project to show how momentum and force correlate to put a force on an object. In this experiment, there were two parts. The first part we took a shoe lace and tied the end to a small ball. Then, we laced the remaining shoe lace through an empty thread spool. The idea that I got out of this experiment was to show the impact that gravity has on the ball, which related to the planets in a sense. Next, we took a line of thread and taped it to the wall, but before we taped it we threaded a straw in it. The straw was then taped to a blown up balloon. After securing the balloon, we released the pinched end so the balloon would take off on the upward path of the string. It worked because the force given from the air in the balloon created momentum for the straw that was on the string. The momentum created an impact on the straw as well to make it move at a stronger pace.
The relationship between mass and weight is commonly misconstrued. Mass in the amount of “stuff” in an object. An object cannot lose mass. Weight, on the other hand, is a force. You can lose weight and gain weight which also alters the force of gravity. For example, when humans walk on the moon, their mass doesn’t change. The only way a person’s mass could change would be the loss of a limb. But that person has the same shape and mass as they would on Earth, but on the moon their weight would be far less due to the lack of gravity.