Physics
A body needs a force F1, just to start motion on a surface, a force F2, to continue its motion and a force F3 to roll on the surface. What is (i) the static friction (ii) sliding friction and (iii) rolling friction? State whether F2, is equal, less than or greater than (a) F1 and (b) F3.
Force
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Answer
(i) Since F1 is needed to start the motion which means it behaves like static friction.
So,
Static Friction → F1
(ii) Since F2 is needed to continue the motion which means it behaves like sliding friction.
So,
Sliding Friction → F2
(iii) Since F3 is needed to roll on the surface which means it must be rolling friction.
So,
Rolling Friction → F3
(a) Since F1 is static friction and F2 is sliding friction and as static friction is greater than sliding friction hence, F2 is less than F1.
(b) Since F3 is rolling friction and F2 is sliding friction and as sliding friction is greater than rolling friction hence, F2 is greater than F3.
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