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Physics - Statics

When an object stands still, it simply means that it has a velocity of zero and that its velocity is not changing. The object is said to be in translational and rotational equilibrium. 

An object is in translational equilibrium if its velocity is not changing vertically or horizontally. 

An object is in rotational equilibrium if its velocity is not changing about any axis. 

It is important to remember that if something is not moving or if a series of things linked together are not moving, then every single point in the whole system is in equilibrium.