Question

Rotational analog of force is:

Answer 1

Hint:An object can be in either of the two states, state of rest or state of motion. Inertia is the property of an object which resists any change in its current state of rest or motion. So, we have to apply some push or pull to change these states of an object and this push or pull is called force.


 Complete step by step solution:
There are two types of motion, linear and rotational. When an object is free to move it will execute linear motion but if we fix one of the ends of the object then only one motion is possible called rotational motion. An example of linear motion is when you push a book kept on the table and that of rotational motion is closing or opening a door.
To move an object in linear motion we need to apply a push or pull and this push or pull is known as force. Similarly, when we want an object to execute a rotational motion, we need a force to be applied and this force in rotational motion is called torque. Torque is the turning effect of force or rotational force.
Torque is the product of the magnitude of the force and perpendicular distance from the axis of rotation to the point where force is being applied.
Hence, a rotational analog of force is Torque.

Note:
Inertia is the property of an object due to which either object will be at rest or keeps moving with a constant velocity until there is no external force acting on it.
Newton’s first law, the law of inertia talks about this property of the body.
The analog of inertia in rotational motion is a moment of inertia.
The way we need force to move an object in a straight line, similarly we need force when we move an object whose one end is fixed.