Question 1 Page 118 - 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?

Answer

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.