Laws of Motion 3 Question 9
9. A block of mass is on an inclined plane of angle . The coefficient of friction between the block and the plane is and . The block is held stationary by applying a force parallel to the plane. The direction of force pointing up the plane is taken to be positive. As is varied from to , the frictional force versus graph will look like
(2010) (a)
(c)
(b)
(d)
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Answer:
Correct Answer: 9. (a)
Solution:
- When
(downwards)
Hence, friction is first positive, then zero and then negative.