Question

Define inertia. Write an activity to show that inertia of a body depends on its mass.

CBSE Class IX Science SA 2 (3 Marks)

Answer 1

Inertia : Inability of the body to change its state of rest or state of uniform motion by itself.
Activity
 Apply some force on a football.
 It flies away as it has small inertia.
 Apply same force on same size of stone.
 The stone hardly moves as it has more inertia.

Answer 2

Inertia is a property of any body to resist the change in its state of rest, motion and direction.

When we throw a cricket ball and rubber ball of same size, cricket ball has more inertia because of its mass.

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