Being that the concept of relative motion and frame of reference is counterintuitive to what our eyes see, here's another example: a skydive....
Watch the video (http://www.youtube.com/watch?v=Jz8lbjxLwlo). From the camerman's P.O.V., the parachuter goes upwards when he deploys his 'chute. Truth is, they DON'T go up! Why does it look that way to the cameraman and what would someone on the ground (external p.o.v.) see of both skydivers?
From the cameraman's point of view, it appears as if the parachuter is moving upwards when he first deploys because of the specific angle he is at, which contributes to the concept of relative motion. When the parachute is deployed, the rate of the fall is slowed down, causing it to appear that they are moving upward, against gravity.It appears that the parachute is pulling to sky diver up because the diver with the camera is still falling at full speed. Someone witnessing the fall from the ground would probably not notice a difference in speed until the two divers got closer to the ground.
ReplyDeleteIt seems as if the guy on the ‘chute was going up because the parachute slows down the fall. In the eyes of the cameraman, he sees the man going up because his acceleration is decreasing. Now, the guy with the ‘chute is going at a slower speed than the cameraman; just like when the cars gradually got further apart from each other, this instance is the same case. The cameraman is going faster in the same direction so he sees the ‘chute gradually getting smaller, creating an illusion that the ‘chute is going backwards (or back upwards in this case). A third person perspective would see the ‘chute falling behind as the cameraman proceeded falling at a fast rate. The cameraman would be falling faster, and the gap between the two would gradually grow since the ‘chute is going slower.
ReplyDeleteFrom the cameraman's point of view, it looks like the man on the parachute was going up, but in actuality, he was going slower than the other man which is why he was farther up then the other one. The distance between them was increasing as the acceleration was changing. From a man on the ground it would look as though the man on the 'chute was going up as well but he would now it was because he deployed his parachute. For the cameraman, he is still falling at the speed of the other man without the 'chute so it looks as though the parachute is going higher up, because the velocity is now changing its direction. Its not going up, but just falling down slower.
ReplyDeleteWhen the man deploys his shoot it looks as though he's moving up because of the sudden decrease in his speed. Although the man decreases his speed because the parachute opens which slows him down, the cameraman stays at the same point of view and acceleration which causes the parachuter to appear as though he is now traveling up. The sudden decrease in acceleration by the parachuter also decreases the distance between the camera man and the parachuter so it appears as though he's traveling up when in reality, he is only going slower. Moreover, someone on the ground would see the reality of the situation. They would see the cameraman falling at the same speed and then they would see the parachuter slow down, but still fall, only at a slower speed. The distance between the parachuter and cameraman would decrease but the parachuter would still be coming down.
ReplyDeleteThis comment has been removed by the author.
ReplyDeleteFrom the cameras point of view, it looks like the parachuter is moving up when he deploys his chute. This is because there is a sudden decrease in acceleration, which increases the distance between the cameraman and the parachuter because the cameraman is falling at full speed. This makes it look as though he is traveling up when really he is just going slower. Someone on the ground would not notice the difference of speed until both the cameraman and parachuter were closer to the ground. Once the witness on the ground has a closer view of them, the witness will see that the cameraman is falling faster, while the parachuter is falling at a slower speed.
ReplyDeleteAs the men jump out of the plane, they are descending at about the same speed. However, since the skydiver deploys his parachute, he drastically decreases his speed as the cameraman maintains his speed. Because the cameraman is the 1st person and Zero the Hero, everything happens relative to him. Since he maintains his fast speed going toward the Earth while the skydiver abruptly decreases his speed, it appears as if the skydiver is shooting up, but he is actually still descending, just at a lower rate of speed. If people were externally observing these men from the ground, they would notice the objective truth, that they are both descending toward the Earth, just at different speeds. Once the skydiver deploys his parachute, the men would notice that his speed is decreasing and that he is simply descending at a lower rate compared to the speed of the cameraman.
ReplyDeleteFrom the cameras point of view it looks like the man with the parachute goes up because the camera man is still falling while the parachute opens. The sudden decrease in speed creates a false illusion of the parachute moving upward. That is not the case because the cameraman is gaining speed, while the parachute is slowing down. Someone watching from the ground probably would notice the parachute is slowing down and the cameraman maintaing speed. The person on the ground wouldnt notice this "upward illusion" the way the cameraman does.
ReplyDeleteWhile it looks like the skydiver is going up after deploying his shoot, he is actually still moving vertically downwards, it just appears that way because while the parachuter is suddenly decelerating, the camera man continues to move downwards at a higher speed. If you were looking from the ground, you would just see the parachuter slow down after deployment, not move upwards.
ReplyDeleteFrom the cameraman’s P.O.V., the parachuter goes upwards when he deploys his 'chute because the release of the ‘chute causes an immediate decrease in speed. Also, the cameraman has not yet released his ‘chute, therefore gaining more speed than the “already released parachute skydivers”, yet if the cameraman did release his ‘chute before the other skydivers, it would seem as if the divers are falling down faster. Someone on the ground or an external observer is an “actual witness” and they see the truth. Therefore, they would still see all the skydivers falling down, but they would see the “already released parachute skydivers” slow down while the cameraman is falling down faster (until he releases his ‘chute, which I’m sure he will eventually).
ReplyDeleteWhen the cameraman and the other man fall lets say they are going 100 mph downwards. When the other man pulls his parachute his velocity decreases causing him to go lets say 50 mph. From the cameraman's POV it looks like the other man is up but in fact he is just decelerating. From the ground, a bystander will just see the camera man fall at a constant rate and the other man start to slow down. Both jumpers are still moving downward from his POV.
ReplyDeleteit seems like from the cameraman's P.O.V that the parachuter goes upward and almost comes to a complete stop. However he does not go up the parachuters rate of fall just slows down, and also gravity has slowed him down, in comparison to the cameraman who is still falling at a constant rate. Someone watching from the ground would probably not be able to see what was happening but if they could then, they would see the camera man falling down at a constant speed while the parachuter is falling at a slower pace because his parachute is open, also you would not see the parachuter go upward you would see him fall just at a slower pace.
ReplyDeleteFrom the camera man's POV, it appears that when the skydiver releases his parachute he goes higher into the air; however, the skydiver just rapidly deaccelerates when his parachute goes out because it uses the air caught inside to slow him down. He appears to be going higher to the camera because the camera man is still falling at his original speed, which is now faster than the skydiver. If we were watching from the ground, we would see that the camera man remained falling at his constant speed, while the skydiver with the parachute would still be falling down, but at a way slower speed.
ReplyDeleteThe cameraman's POV makes it seem like the parachuter is going upwards because of the sudden decrease of speed. The release of the parachute slows him down and creates the effect that he is going up. The cameraman's POV is the difference in speed and distance, therefore creating the effect that the parachuter is moving upwards. From the ground, you would see the cameraman continuously move toward that ground and the man with the parachute do the same at a slower rate due to his decrease in speed.
ReplyDeleteBoth the camera man and the skydiver are flying downwards towards the ground but once the skydiver releases his parachute it seems that he is flying upwards towards the sky. This happens because when the skydiver releases his parachute the air catches it and slows him down, meanwhile the camera man is maintaining his speed and continuing downward without anything to slow him down. If you were on the ground looking up, you'd see the skydiver continuously coming down towards the earth but not as quickly as the cameraman due to his decrease in speed.
ReplyDeleteFrom the cameraman's point of view, it looks like the parachuter is moving upward when he deploys because of the abrupt decrease in speed, and because of the angle the cameraman is looking at the parachuter. To the cameraman, who is still going full speed, it looks like the parachuter is moving upward because when the parachuter deploys the distance between the cameraman and the parachuter decreases. This is because the cameraman is still going full speed, while the parachuter is not. And because of this, it looks like the parachuter is going up when really he is just going slower. However, if someone was watching from the ground, he would he that the cameraman is going full speed, while the parachuter is going slower. The man on the ground would see that both skydivers are going downward, but the parachuter is going slower than the cameramen; therefore, not going upward.
ReplyDeleteThe man in the parachute looks to be going upward from the camera man because of the sudden decrease of speed, due to the parachute being deployed. The camera man is still falling, but the man with the parachute has a lesser speed, so the camera man will travel farther per second than the other man. The parachute increases the surface area for resistance against the air, which decreases the speed. From the ground, both the man and the camera man would still be going downward, just at different speeds.
ReplyDeleteFrom the camera man's point of view, it looks like the parachuter is moving upward when he deploys because of the abrupt decrease in speed. The camera man is still falling at full speed, so it looks like the parachuter is moving upward because when the parachuter deploys the distance between the cameraman and the parachuter increases. This is because the cameraman is still going full speed, while the parachuter has suddenly begun to slow down. The parachuter looks like he is going up, but he really has just slowed down. From the ground you would see both people falling to the floor, yet the parachuter would appear to be going slower than the camera man.
ReplyDeleteOverall the drastic decrease in speed because of the opening of the parachute makes it seem as if the parachuter is moving up. Moreover, since the speed remains fast with the cameraman then it appears as if the parachuter moves up rather than continuing to go down. Concluding it would seem the both people are falling together for some person on the ground, but the one who opened his chute would go a lot slower.
ReplyDeleteIt looks like he is going up to the camera man because the sky diver is falling much slower than him because the parachute opened and he has something stopping his momentum. It only looks like he is going up because the camera man is falling so much faster!
ReplyDeleteFrom the point of view of the the cameraman, it seems as if the man in the parachute is going up. They descend at the same rate, but when the parachuter deploys his parachute, his acceleration is decreasing, while the camera man is still going down at the same speed. The change in acceleration increases the distance between the two. From the perspective of someone on the ground they would see the parachuter is only slowing down, not going up, unlike from what the cameraman sees. All they see is the cameraman coming down at a faster rate.
ReplyDeleteThe cameraman's point of view makes it seem as if the parachuter is moving up because of the drastic decrease in speed that the parachuter is experiencing due to the opening of the parachute. Since the cameraman continues to fall at a rapid speed, it seems like the parachuter is moving up because of relative motion and the slower speed that the parachuter is falling at.
ReplyDeleteThe men in the parachute seem to be moving upwards because when the parachute is deployed, the speed of the parachute men rapidly decreases causing a slower fall to the ground; compared the to camera man who is still in a free fall and falling at a much faster rate. If one were to watch from the ground, the cameraman would be falling (and seeming to get bigger) at a faster rate than the men with the open parachute, who would be getting closer, but at a slower pace.
ReplyDeleteDue to the sudden increase in speed, (from the cameraman’s point of view) it looks as though the skydiver is moving up. Since the skydiver released his parachute, the air is caught inside of it, slowing him down. The cameraman’s pace maintains as nothing is altering his speed. An observer watching from the ground would witness the cameraman falling down at constant but faster speed, while the skydiver who released his parachute would begin to slow down.
ReplyDeleteAs gravity is a constant accelerator both skydiver and cameraman are falling at an equal speed. When the skydiver deploys his 'chute the air caught in the material slows his decent however the cameraman doesnt deploy his causing his acceleration to maintain. A viewer from the bottom would see to humans falling at the same speed and slowly growing bigger; however as soon as the skydiver deploys his 'chute the cameraman will become bigger and closer to the ground quicker
ReplyDeleteThe men are descending at relatively the same speed and when the skydiver deploys his parachute, he decreases in acceleration (but is still descending). This change makes it seem as if the skydiver goes upwards when he deploys his parachute because the cameraman maintains the same speed, and being zero the hero, everything occurs relative to him. If people on the ground were watching both skydivers, you would see the skydiver slow down after deploying, while still descending and observe the cameraman descending at a constant rate.
ReplyDeleteFrom the cameraman's point of view, the parachuter seems to appear as if he is going upward because of the sudden decrease in speed due to the parachute being deployed. The distance between the parachuter and cameraman increased because of the change in speed of the parachuter, while the cameraman was still at the same speed. Someone watching this from the ground, the external view, would see the actuality of the situation; the cameraman is traveling at a high speed downward, while the parachuter is also going downward, but at a much slower speed.
ReplyDeleteFrom the cameraman's point of view it looks like the parachutist is going upwards because of the parachutist abrupt stop and continues to decrease his speed when (and after) the parachute opened. Since the cameraman's parachute has not been deployed yet his speed is increasing the longer he waits, he sees other parachutist go up. If someone were to see from the ground, they would see the cameraman falling at a rapid pace and the other men decreasing at a slower rate.
ReplyDeleteThe camera man is keeping the same speed, while the skydivers parachute is decreasing his speed darastically. It appears to the camera man that the skydiver is going upwards when he deploys his chute because the camera man is still going at his fast speed. The diver is accelerating, while the camera man is maintaining his original speed. Some one on the ground at an external p.o.v would see both sky divers coming down very quickly, but he would notice that the parachuter is coming down slower compared to the speed of the camera man. Someone at the external p.o.v on the ground would see the truth of the situation, and know that the parachute is not going upwards.
ReplyDeleteFrom the camera mans point of view, it looks like the parachuter is going up even though he isn’t. When the parachute deploys the parachuter is being slowed down significantly while the cameraman is still falling with full speed. The continual fall of the cameraman makes the parachuter look like he is falling upward, when in reality the cameraman is just falling at a faster rate than the parachuter. The person on the ground can see both the parachuter and the cameraman because his POV allows him to keep track of both men since his position is not moving.
ReplyDeleteIt looks like the man in the parachute is going upward from the cameramans point of view because of his abrupt and sudden decrease in speed because the parachute was being deployed. The cameraman, however, is still falling and the man with the parachute is falling slower (less speed), so the cameraman will therefore travel farther than the other man per second. The parachute is what causes resistance to the air which slows him down. From the ground, however, both the man and the cameraman would still be traveling downward, only at different speeds.
ReplyDeleteThe man looks as if he is flying upward but in reality he is just slowing down because he released the parachute. The camera's angle catches him slowing down which makes the man look as if he is going upward but an observer from the ground would only see the man with the parachute slowing down.
ReplyDeleteWhen the man positioned his shoot, it appeared as if he was moving up due to the sudden decrease in his speed. While the man decreases his speech as the opened parachute slows him down, the cameraman stays at the same point of view and acceleration, which causes the parachuter to make it look as though he is now travelling up. The decrease in acceleration by the parachuster also decreases the distance between himself and the camera man, which makes it appear as if he’s traveling up, when he is actually just going slower. Also, someone watching from the ground would see the “truth” or actual situation. They would see the cameraman falling at the same speed and then they would see the parachuter slow down, but still fall at a slower speed. The distance between the parachuter and cameraman would decrease but the parachuter would still be coming down.
ReplyDeleteFrom the cameras angle it seems like the parachuter is going upward because of his abrupt stop because his decreasing speed. From the ground perspective it just seems as they are falling but just at a slower less abrupt stop
ReplyDeleteIt appears that the camera man is going upward because his speed is suddenly decreased due to the parachute opening up. The decrease in acceleration, speed and distance makes the parachuter seem like he is traveling up, but in reality he is just getting slower. The camera man, however, continues to fall at a steady speed, which makes the parachuter appear that it is going upward. For someone on the ground, they would see what was actually happening between the camera man and parachuter because the distance between them is decreasing, and both the camera man and the parachuter are going downwards toward the ground. The point of views of each party allows them to have different interpretations of the parachuters and camera man's distance and speed. (late because I was not in class on Monday)
ReplyDeleteWhen the parachute opened, it seemed as if the two people just shot up, which has to do with relative motion. The POV was moving at a constant speed and when the chute opened he was still moving at that speed which is the "zero the hero," theory. If someone was watching from the ground, they would see that the people who opened the chute dramatically slowed down, however they are not going up. From the POV, it looked as if the people went up after the chute opened
ReplyDelete