Physics: System of Properties
Overview
Every particle of the body moves in a circle, which lies in a plane perpendicular to the axis and has its centre on the axis. shows the rotational motion of a rigid body about a fixed axis (the z-axis of the frame of reference)
Physics System of Particles
Ideally a rigid body is a body with a perfectly definite and unchanging shape. The distances between all pairs of particles of such a body do not change.
Note: No real body is truly rigid, since real bodies deform under the influence of forces. But in many situations the deformations are negligible and hence can be considered as rigid bodies.