- #1

ChessEnthusiast

- 115

- 3

A bus is moving at constant speed, a man is standing on the bus and is not holding to anything - he is simply standing.

Now, the bus starts breaking with constant negative acceleration and so the man will change his relative position due to the force of inertia.

Now, let's say we don't believe in the existence of the force of inertia and want to solve this problem in an inertial frame of reference.

The only force of contact between the man and the bus is the force of friction.

The man will move forward due to braking.

Therefore, is the force of friction the force causing his motion relative to the floor on the bus?