Class 9 · Science · Exploration

6. How Forces Affect Motion

Try question 1

The tendency of a body to stay at rest or in uniform motion is called

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Answer and explanation

Answer: B. inertia

This is described by Newton's first law of motion.

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Try question 2

A force gives a 2 kg mass an acceleration of 3 m/s². The force is

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Answer and explanation

Answer: C. 6 N

F = ma = 2 × 3 = 6 N.

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Try question 3

'Every action has an equal and opposite reaction' is Newton's

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Answer and explanation

Answer: C. third law

A rocket moves forward as gases are pushed backward — third law.

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