Why do we go back when bus starts suddenly?

This is due to inertia of rest of upper part of the passengers body when the bus or train suddenly starts moving, the lower part of the passenger's body starts moving along with the bus or train while upper part of the body has a tendency to remain in the state of rest due to inertia of rest and hence falls backward.



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When the bus accelerates from rest: When a bus abruptly starts moving, the passengers tend to slide backward due to inertia, as the passenger's inertia tends to oppose the bus's forward motion. Hence, the passenger tends to fall back when the bus accelerates forward.

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When a bus starts suddenly, the passengers are pushed backwards this happens due to inertia the upper body wants to remain at rest that's why it moves backwards. We are standing in a bus and the bus begins to move suddenly. Now we tend to fall backwards. This is explained by which of Newton's law of motion.

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A getting passenger getting down from a moving bus, falls in the direction of the motion of the bus. This is because his feet come to rest on touching the ground and the remaining body continues to move due to inertia of motion.

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When a bus starts suddenly,its passengers tend to fall backwards because due to their inertia, the passengers tend to remain in a state of rest even when the bus starts moving.

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This is because of inertia of motion. The part of our body, which is in contact with the bus, changes the direction of motion. However, the rest of the body tries to move in the same direction as before because of inertia of motion.

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To recap, Newton's first law, the law of inertia, states the following: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted on by an unbalanced force.

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