Question 8: Define and explain ‘force’.
Definition: Force is the agency which
- Moves or try to move a stationary body.
- Stops or tries to stop a moving body.
This means force is the agent which produces or tries to produce acceleration (includes retardation) in a body. If ‘m’ is the mass of a certain body and ‘F’ is the force applied to it, then,
Where ‘a’ is the acceleration produced in the body.
Unit of force: Looking at the above equation of force as product of mass and acceleration, the unit of force is kg ms-2. This unit is generally called ‘newton’, named after famous physicist, Sir Isaac Newton.
Dimensions of force: Dimensions of force can be derived from the above equation and unit of force. It is