Lesson: Chapter 12 — Equilibrium of Forces

12.4. Equilibrium under three non-parallel forces 5 of 8 Reset answers

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Question 5

A body on a horizontal surface is pulled in one direction with a force of 20 N. What force must be applied in the opposite direction to bring it to rest?

A Zero B 20 N C 40 N D 10 N

The right answer is the one marked above.

20 N. For equilibrium under two forces they must be equal in magnitude.

It must also act in the opposite direction and along the same line — magnitude alone is not enough.

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