physics terminology (torque & rotational dynamics)

angular displacement

the change in angular position (theta) for a rotating object.

angular velocity

velocity of a rotating object

angular acceleration

acceleration of a rotating object

angular position

location of an object on a rotating system

torque

a force that causes rotation

action

force

point of action

where the force is applied

line of action

an imaginary line parallel to an action, passing through the point of action

pivot

point of rotation

lever arm

position vector the connects the pivot to the point of action

rigid body

object that does not bend, stretch, or compress

moment arm

distance between a mass' location and the axis of rotation

moment of inertia

a measure of an object’s resistance to rotation dependent on how the object’s mass is distributed