Question

Give two examples of inertia kinds.

Answer 1

Examples of inertia of rest:

1. Imagine a pile of books placed on a sheet of paper. If the paper is suddenly pulled with a jerk, the books are left behind, because of the inertia of rest.
2. When a carpet is suddenly jerked, the dust flies off. Because of the sudden movement, the carpet moves, but dust on account of the inertia of rest is left behind.

Examples of inertia of motion:

1. A man standing in a moving bus falls forward as soon as the bus stops, due to the inertia of motion of the upper part of his body.
2.  Before taking a long jump, a boy runs a certain distance, because in doing so he picks up the inertia of motion, which helps him in taking a longer leap.

Examples of inertia of direction:

1.  It is a common experience that passengers tend to fall sideways when a speeding bus takes a sharp turn. It is because, when the bus is moving along a straight line in a particular direction suddenly takes a sharp turn, the passengers on account of inertia of direction continue along their direction and hence fall sideways.
2. The sparks produced during the sharpening of a knife against a grinding wheel leave the rim of the wheel tangentially because of the inertia of direction.