A body in equilibrium__________________?
Correct answer: C. May be at rest or in uniform motion
- A. Always at rest
- B. Always in uniform motion
- C. May be at rest or in uniform motion
- D. May be at rest or in motion
Explanation
When the resultant force and resultant torque are zero, a body has no acceleration and can either remain at rest or continue with constant velocity. Rest is therefore not required for equilibrium. Students may choose a because they confuse equilibrium with a stationary body, ignoring dynamic equilibrium.
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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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