I have some questions which i cant seem to answer and understand. Here goes: Imagine a bee flying inside a moving train moving at a constant velocity in one particular direction. the bee is flying in mid-air and is not in contact with any of the train parts. qns 1: does the bee need to continously flap its wings(so to speak) to fly forward in other to maintain in the same position? qns 2: is there any difference when the frame of references are one inside the train and one outside the train. qns 3: what will happen if the train accelerates? i feel that in this case, the bee will have to exhaust energy to fly forward in order to maintain in the same position but i am not sure and doesnt know to explain it. thanks a million for helping me out with this question.