what is the meaning of:-
the resultant of all torques acting on the body should be zero so that the body does not rotate on the application of a force
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It means that the number of forces acting on the body are unable to displace it from its position . One could say that equilibrium force is applied . Torque is the rotation . Force is any external push or pull. When force is applied at 90 degree then the resultant of force is zero. Torque is the force that causes rotation.
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