Question

Why do we fall forward when the bus stops and fall backwards when tge bus starts to move?

Answer 1

So when the bus or train stopped suddenly, a passenger sits inside tends to fall forward. ... The reverse happened when the bus or train started suddenly, then that time our body fall backward because lower body stick with the bus so it goesforward while the upper part tries to remain in rest due to inertia of rest.

Answer 2

the devil is moment of inertia. when the bus starts person sitting in the bus remains at rest so he fall backwards and when brakes are applied the person remains in state of motion so falls forward.