Presentation science Selina ICSE Concise Physics for Class 10 (2021-22)

Force
Force is the physical cause that produces a change in direction,speed or
size of an object.
A force applied on an object can produce four types of effects –
1.Force can move a stationery object and can stop a moving object.
2.Force can change the speed of a moving object making it to move
slower or faster.
3.Force can change the direction of motion of an object.
4.Force can change the shape of an object.

, A rigid body when acted upon by a force, can have two kinds of motion:
• 1.Linear or translational motion
• 2.Rotional motion

*1.LINEAR OR TRANSLATIONAL MOTION – When a force acts on a
stationary rigid body which is free to move, the body starts moving in
a straight path in the direction of the applied force. This is called linear
or translational motion.

*2.ROTATIONAL MOTION – When a body is pivoted at a point i.e. not free
to move and a force is applied on the body at a suitable point. It rotates
the body about the pivoted point. This is the turning effect of the force
and the motion of the body is called rotational motion.