Question

By drawing diagram define or explain:

1. Point of action of force.
2. Line of action of force.
3. Principle of transmissibility of force.

Answer 1

1. Point of action of force: The point on a rigid body where an external force acts or is applied is called the point of action of force. (In the diagram below, point A is the point of action).
2. Line of action of force: An imaginary straight line passing through the point of action of force and drawn in the same direction along which the force acts is called the line of action of force.
3. Principle of transmissibility of force: It states that the point of action of a force can be transmitted (shifted) to any other point (like B) anywhere along its line of action without causing any material change or difference in the external movement or state of the rigid body.