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A person is sitting on a bike with his friend. When his friend started his bike suddenly, then his friend falls back. Why is it so?

A person is sitting on a bike with his friend. When his friend started his bike suddenly, then his friend falls back. Why is it so? Correct Answer Inertia of rest keeps the upper part of body at rest whereas lower part of the body moves forward with the bike

CONCEPT:

Newton’s First Law:

  • A body continues to be in its state of rest or of uniform motion along a straight line, unless it is acted upon by some external force to change the state.
  • If no net force acts on a body, then the velocity of the body cannot change i.e. the body cannot accelerate.
  • Newton’s first law defines inertia and is rightly called the law of inertia.


EXPLANATION:

Inertia of rest:

  • It is the inability of a body to change by itself, its state of rest. This means a body at rest remains at rest and cannot start moving by its own.
  • When a bike starts suddenly, the bikers tend to fall backward on account of the inertia of the rest of the upper part of the body.
  • When a bike suddenly starts, the force responsible for bringing the bike in motion is also transmitted to the lower part of the body, so this part of the body comes in motion along with the bike. While the upper half of the body (say above the waist) receives no force to overcome the inertia of rest and so it stays in its original position. Thus there is a relative displacement between the two parts of the body and it appears as if the upper part of the body has been thrown backward.

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