A body needs a force F1 just to start motion on a surface, a force F2 to continue it's motion and a force F3 to roll on the surface. What is ( 1) the static friction (2) sliding friction and (3) rolling friction? state whether F2 is equal, less than or greater than (1) F1 and (2) F3.
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Explanation:Static Friction - th friction which acts when body is at rest .
Example - A book kept on a table .
Sliding friction -The friction which acts when one surface slides over another surface .
Example - A shoot case is slides on a smooth surface .
Rolling Friction - When one surface Rolles over another surface by the use of wheels , ball bearing etc.
Example - trolly bags attached with wheels ,vechils have wheels
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