Engineering Mechanics
A force while acting on a body may

Balance the forces, already acting on it
All of these
Change its motion
Give rise to the internal stresses in it

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Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

Algebraic sum of moments of all the forces about any point should be zero
All of these
Algebraic sum of the vertical components of all the forces should be zero
Algebraic sum of the horizontal components of all the forces should be zero

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