Explanation The equation represents the net force acting on a body in mechanical equilibrium. A system is said to be in mechanical equilibrium if the system is at rest or moving with constant velocity. The common thing in both the cases is that the acceleration gained by the system is zero. The meaning of no acceleration is that the net force acting on the system is zero. The symbol ∑ used to represent the sum of parameters. F denotes the individual force acting on the system. ∑ F represents the vector sum of all individual forces acting on an object. It is the algebraic sum of magnitude of each force considering the direction too. Consider a force F applied in a direction. The same amount of force applied in opposite direction is − F

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Chapter 1, Problem 14RCQ

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The meaning of ∑F=0.

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The meaning of ∑ F = 0 .

Solution Summary: The author explains that sum F=0 denotes the effective force acting on system is zero even there exists multiple non-zero forces.

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