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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

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