CBSE Class 9 Answered

To bring a stationary body into motion or to bring a moving body to a halt, a contact with the body is necessary. Such forces are called contact forces.

Example: When a cricketer hits a ‘six’, there is increase in velocity of the ball and the direction of velocity of the ball changes.

When an object experiences force without contact; such a force is called field force.

Example: When a magnet is kept near iron-pins, the iron-pins get attracted to the magnet and cling to it.