m1 = 20 kg, determine the mass of m2 which will cause the system to stay in equilibrium.  The pulley does nothing other than change the direction of the force from the hanging mass.

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Rotational Equilibrium And Rotational Dynamics

In physics, the state of balance between the forces and the dynamics of motion is called the equilibrium state. The balance between various forces acting on a system in a rotational motion is called rotational equilibrium or rotational dynamics. 

Equilibrium of Forces

The tension created on one body during push or pull is known as force.