The first condition of equilibrium requires that
Correct answer: A. the vector sum of all forces acting on the body is zero
- A. the vector sum of all forces acting on the body is zero
- B. the sum of all torques about any point is zero
- C. the body is at rest
- D. no force acts on the body at all
Explanation
With zero net force there is no acceleration of the centre of mass, which is translational equilibrium. The second condition deals with rotation and requires zero net torque, and a body needs both to be in complete equilibrium. Note that equilibrium allows motion at constant velocity, so being at rest is not required.
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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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