When things are at rotational equilibrium, they either don't rotate or they rotate at a constant rate (angular velocity, frequency).Conventionally, positive torques act counterclockwise, negative torques act clockwise.When things are at rotational equilibrium, the sum of all torques = 0.Rotational equilibrium (Sum of Torque = 0) A skydiver before he or she reaches terminal velocity.A car either accelerating or decelerating.An apple falling toward the Earth with an acceleration of g.A skydiver falling at terminal velocity.Deceleration is acceleration in the opposite direction.If an object is accelerating, it's not in equilibrium.Things at translational equilibrium either don't move, or is moving at a constant velocity.When things are at translational equilibrium, the vector sum of all forces = 0.m/s 2 Translational equilibrium (Sum of Fi = 0).The magnitude of the force is often labeled beside the arrow.The direction of the arrow is the direction of the force.In the MCAT, a force is indicated by an arrow.Force makes things accelerate, change velocity or change direction. Yet another way to put it: when something is in equilibrium, there is no overall acceleration.Another way to put it: when something is in equilibrium, it is either at rest or moving at constant velocity.
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