Lesson: Chapter 18 — Work, Energy and Power

18.1. Work 4 of 6 Reset answers

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Question 4

A force of 20 N acts on an object through a distance of 2 m in its own direction. How much work is done? (Exercise 18.1, row 1)

A 10 J B 40 W C 40 J D 22 J

The right answer is the one marked above.

40 J. work = force × displacement = 20 N × 2 m = 40 J.

40 W has the right number but the wrong unit. The watt measures how fast work is done, and this question says nothing about time.

Answer the question to continue.