State the laws of limiting force of friction .
three marks question
Answers
Answer:
The laws of limiting friction are given below.
1. The limiting friction depends upon the roughness or smoothness of the surfaces in contact and acts tangentially to the interface between them.
2. The direction of force of friction is always in a way that it opposes the direction of the motion.
3. It is independent of area and shape of the surface in contact as long as the normal reaction remains the same.
4. It is directly proportional to the normal reaction between the two surfaces in contact.
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Answer:
(a) The direction limiting frictional force and the direction of motion is always the opposite.
(b) The limiting friction always acts tangential to the two surfaces that are in contact.
(c) The magnitude of the limiting friction and the normal force between the two surfaces are directly proportional.
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