Answer to Question #171559 in Physics for Jerick

Question

 You are in a windowless car in an exceptionally smooth train moving at constant velocity. Is there any physical experiment you can do in the train car to determine whether you are moving? Explain.

Answer 1

No, this is not possible because your mass is significantly smaller that the train's mass and you can't affect its motion. Also, if the car moves at constant velocity, it means that all forces are in equilibrium, which, according to Newton's first law, is indistinguishable from the state of rest.