fly floating in a car? :) Hi Last day we were arguing with my colleagues what will happen with a fly flying in a car when the car suddenly stops :) Will it go forwards (or backwards when the car is accelerating)? Or will it stay stationary? Suppose the following: - the car can stop (and accelerate) *really* fast - the fly is floating (no horizontal movement) - the car is filled with air (what will happen if there is vacuum?) Or another similar experiment: Suppose you have glass bottle and the fly is floating in the middle of it. You throw the bottle from the 6th floor :) Will it smash on the bottom of the bottle when it reaches the gound? Bottle is not deformed! Please answer only if you are 100% sure what will happen and your answer is Physically valid. No guessing please :) P.S. Surely there are similar topics here but I couldn't find any.