1• What is friction ? Explain the different kinds of friction.2 Explain the desirable and undesirable factors of friction3.Give examples of push or pull.4 Give examples of change in speed, direction with the application of force on object
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1- Friction is a force which opposes motion of a solid object over another. There are four types of friction: static friction, sliding friction, rolling friction and fluid friction.
2- A friction is very much desirable to stop the body from its moving condition. A friction is undesirable during ice skating or when a block is lifted or put down on the truck with the help of the inclined plane.
3-Opening and closing a door, Pushing or Pulling furniture, player kicking a football.
4-When a batsman hit a ball with bat, the speed of moving ball changes. when fielder catches the ball the speed of the ball decreases.
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