Why do passengers fall backward 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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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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Initially, the passengers and the bus both are moving in same direction. When the bus suddenly takes a sharp turn, the lower portion of passengers which is contact with the bus tends to move in that direction but the upper portion of the passengers throw an outside. This happens due to the INERTIA OF DIRECTION.

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If I jump up in a moving bus will I land on the same spot where? If the bus is traveling at constant speed, yes. You're moving with the same speed as the bus, and you'll keep moving with this speed while you're jumping. If the bus is accelerating while you jump, you will land in a slightly different spot.

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The reset button is usually located above the back row of seats so the driver walks to the back of the bus (and checks for children) to reset the alarm. In some child safety alarm models there is not a reset button. Rather, the emergency door handle needs to be lifted up to reset the alarm.

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The professionals also suggested that commuters are able to wake up because they're still hearing the announcements of stops even during sleep. 'The brain does screen out some stimuli during sleep,' noted Dr. Chervin. But your brain is actually primed to hear some stimuli more than others, such as your regular stop.

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