Lets say there are 2 pictures of someone flipping a coin and letting it drop in
ID: 2158717 • Letter: L
Question
Lets say there are 2 pictures of someone flipping a coin and letting it drop in a car moving at a constant speed of 30 km/h. One picture is from the reference frame of the car and the other is from the reference frame of the earth.The path followed by the dropped coin is different in each frame of reference.A) What force is acting on the dropped coin in the 2 frames of reference?
B) Is the acceleration expererienced by the dropped coin the same in both frames of reference?If not how does it differ?
C) Is the initial speed of the coin the same in both frames of reference? (That is,is the initial speed of the coin compared to the car the same as the initial speed of the coin compared to objects outside the car?) If not how does it differ?
D) According to Newton's Law, what path should the dropped coin follow in the frame of the reference of the car?
E) According to Newtons's Law what path should the dropped coin follow in the frame of reference of the earth?
F) Does the example of the 2 references support or contradict the first postulate of special relativity? Why or Why not?
H) If you were standing as an observer outside the car, from the motion of the coin could you tell which was at rest, you or the car?
Explanation / Answer
a) gravity + normal in cars frame and gravity + friction + normal in earths frame b) no, its is 0 in cars frame whereas in earth's frame it is the acceleration of car c) no, in earths frame it is the speed of car whereas it is 0 in cars frame d) while dropping coin will follow straight down path in cars frame e) in earths frame it will be projectile motion. f) No h) yes, we can unless the outside world is not einstein's box
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