Three forces acting on a body are in equilibrium. When drawn head to tail they must
Correct answer: B. form a closed triangle
- A. lie along one straight line
- B. form a closed triangle
- C. all be equal in magnitude
- D. be mutually perpendicular
Explanation
A zero resultant means the head of the last vector coincides with the tail of the first, so the three vectors close a triangle. This triangle of forces lets an unknown force be found by scale drawing or by the sine rule. The three need not be equal, and they cannot be collinear unless two of them point the same way.
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About Addition of Vectors
Vector addition combines directed quantities using the head-to-tail, parallelogram and component methods. Work includes finding the resultant magnitude and direction for two or more vectors, resolving vectors into perpendicular components, and distinguishing vector addition from scalar addition, where direction has no role.
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