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• Topic: Newton's First Law of Motion.

• Why do you fall backwards when a bus starts suddenly?

• Did you observe that the bag fell when brakes were applied?

• Do you know why this happened?

• This happened because of inertia.

• Inertia is the tendency of a body to be in a state of rest or in a state of motion.

• Newton's first law of motion defines inertia.

• It states that a body in rest stays in rest and a body in motion stays in motion.

• Unless it is acted upon by an external force.

• So, in this case, when the bag was on the bike, it was moving along with the bike.

• Now, when brakes were applied suddenly.

• The bike stopped but the bag kept on moving forward due to inertia of motion and hence it fell.

• This time the bag fell again.

• Can you guess why?

• Yes, you guessed it right.

• It is also because of inertia.

• When the bag was on the stationary bike, it was at rest.

• Now, when the bike was accelerated suddenly, it moved forward.

• But the bag being at rest, did not move due to inertia of rest and hence it fell down again.

• In this case, when the bus suddenly starts moving forward.

• Our feet which are in contact with the bus start moving forward.

• As a result, the lower part of our body moves forward.

• But the upper part of our body, which is not in contact with the bus still tends to remain in a state of rest.

• The upper part of the body does not move forward along the lower part.

• That is why we tend to fall backwards.

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# Why do you fall backwards when a bus starts suddenly? | #aumsum

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AumSum posted on 2019/04/13
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