What is rotational motion ? Explain it with example.

Here rigid body as a solid metallic or wooden cylinder.

This cylinder shifts from the top of bottom of the inclined plane and thus it has translation motion.

All its particles are not moving with the same velocity at any instant. The particle near from the axis of cylinder has less velocity and particles for away from the axis of cylinder has more velocity. Such type of cylinder velocity is not pure translation it has combined velocity of rotation with it. The line along which the body is fixed is termed as its axis of rotation, its motion known as rotational motion.

If all the particles motion of a rigid body move along circular path and the centre of all these circles fall

on a definite straight line then the motion of the body is called the rotational motion.

If all the particles of a rigid body perform circular motion and the centres of these circles are steady on a definate straight line called axis of rotation.

Examples of rotation motion : A ceiling fan, a potter's wheel, a giant wheel in a fair, a marry-goround etc.