Class 9 · Science · Exploration

7. Work, Energy, and Simple Machines

Try question 1

A force of 10 N moves a box 5 m in its direction. The work done is

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Answer and explanation

Answer: C. 50 J

W = F × d = 10 × 5 = 50 J.

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Try question 2

The SI unit of work and energy is the

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Answer and explanation

Answer: B. joule

1 J = 1 N × 1 m.

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Try question 3

A see-saw is an example of a

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Answer and explanation

Answer: A. lever

It turns about a fixed point, the fulcrum, like a lever.

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