What conditions are needed for static friction to come into play?
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1)The given object should be at rest
being in contact with each other.
2)There should be interlocking of irregularities on the surface in contact.
3)A force should act on one of the objects and tried to move.
4)Still object should remain at rest relative to another surface on object in contact.
Then static friction comes to play to hold the contacting object placed related to each other. Hence the static friction is developed equal to the applied force
Explanation:
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