What is rotatory motion?

Hint: Rotatory motion is the physical motion that appears when an object revolves or spins on an axis. In a simple word, we can define it as fluctuation of any object in any axis surface.

Complete step by step answer:
Rotatory motion can be explained as the movement of any object around an axis. A generalised example of this process is the fans of the helicopter gripping about a pivot. If all the particles ploy along rings in the parallel planes, the particular body is forenamed to acquire rotational motion. The center of these rings deceive on a rigid line upright to the parallel planes and it is termed as the axis of rotation.
Due to the external force, the moment of force or torque is explained as the twisting effect of force around the rotational axis. Torque is defined as the product of implied force and its upright distance from the rotational axis.
The algebraic summation of the clockwise and anticlockwise moments at any point is equal is zero, wherever the rigid body is in equilibrium of rotation.
Hence, Clockwise moment = Anticlockwise moment
The combination of two equal and opposite forces seeming on a rigid body along two distinct lines of action establish a couple. The total exterior force is zero but the torque is non-zero in a couple. The coupled moment for rotation motion of rigid body is explained as the product of either forces or the upright distance.

Note: Always remember that the rotation of an object on any reference axis is termed as rotatory motion and even the torques value depends upon the perpendicular distance from the axis of the object rotation.