Lesson: Chapter 12 — Equilibrium of Forces

12.3. Equilibrium under three parallel forces 5 of 7 Reset answers

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Question 5

Which of these is one of the conditions for equilibrium under three parallel forces?

A One force must act opposite to the other two B All three forces must be applied at the same point C All three forces must act in the same direction D All three forces must be equal in magnitude

The right answer is the one marked above.

One force must act opposite to the other two. Otherwise there is no way for them to cancel.

The three need not be equal — on the metre rule only the sum of F₁ and F₂ must equal W; the two of them need not equal each other.

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