what's the difference between dynamic and static equilibrium?
 Static equilibrium is a case where a system in equilibrium will return to equilibrium when an outside force pushes a system out of equilibrium whereas dynamic equilibrium is a case where a system in equilibrium will not return to equilibrium once pushed out of equilibrium. Static balance refers to the ability of a stationary object to balance whereas dynamic balance, on the other hand, is the ability of an object to balance. 