NEET Physics: Questions 959 - 962 of 2099
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Question number: 959
Choose the correct statements -
(1) Force of friction is partially independent of microscopic area of surface in contact and relative velocity between them, (if it is not high)
(2) Normally with increase in smoothness friction decreases. But if the surface area are made too smooth by polishing and cleaning the bonding force of adhesion will increase and so the friction will increase resulting in ‘Cold welding’
(3) Friction is a non-conservative force, i. e. work done against friction is path dpendent.
(4) Force of friction depends on area
Select the correct answers and mark it according to the following codes:
2 and 4 are correct
1, 2 and 3 are correct
1 and 2 are correct
1 and 3 are correct