Question

an old person standing in a moving bus falls forward when the driver suddenly stops the bus at the red signal.Why?

Answer 1

Answer:

inertia

Explanation:

the man is also in motion w.r.t to ground but he is at rest w.r.t bus so when the bus hits the break the man is still at motion with some velocity. so he won't be able to stop all of a sudden because only his foot is in contact with the bus and it will come to rest but rest of the body is facing no opposition.

Answer 2

The passengers in a bus tend to fall backward when it starts suddenly due to inertia as the passengers tend to remain in the state of rest while the bus starts to move. When the bus stops suddenly, people fall forward because their inertia as they are in state of motion even when the bus has come to rest.

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