Answer:
`Whenever the surface of one body slides over that of another is exerts a force on the other which opposes the motion of the body this is called frictional force. for example a book sliding on a surface and a ball rolling on a surface.
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Answer:
`Whenever the surface of one body slides over that of another is exerts a force on the other which opposes the motion of the body this is called frictional force. for example a book sliding on a surface and a ball rolling on a surface.