Any movement of a rigid body can be resolved into two components: displacement and rotation. A movement is called displacement when all the points of the body describe parallel straight lines. Rotation occurs when the points of a straight line of the body designated as the axis of rotation do not change position and all the other points describe circles the centres of which are on the axis of rotation and the planes of which are at right angles to this axis.
KeywordsRigid Body Linear Velocity Small Mass Angular Acceleration Linear Acceleration
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