Questions from inside the chapter

Class 9
Chapter 9 Class 9 - Force and Laws Of Motion

## Which of the following has more inertia:

(a) a rubber ball and a stone of the same size?

(b) a bicycle and a train?

(c) a five rupees coin and a one-rupee coin?

Inertia depends on mass of the body.

More the mass, more the inertia

Let’s look at all these parts

1. a rubber ball and a stone of the same size
A stone will have more mass than a rubber ball of the same size.
Since more mass means more inertia,
the inertia of the stone will be more than the rubber ball.

2. a bicycle and a train
A train will have more mass than a bicycle.
Since more mass means more inertia,
the inertia of the train will be more than the bicycle.

3. five rupees coin and a one-rupee coin
A five-rupees coin will have more mass than a one-rupee coin.
Since more mass means more inertia,
the inertia of the five-rupees coin will be more than the one-rupee coin.

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