A common question in physics, which often arises is the question about whether a

Question

A common question in physics, which often arises is the question about whether a friction force, f, does work. If a block is sliding down a rough surface with kinetic coefficient of friction, Mu_k. Carefully reflect on discussions held in class, and then, pick the correct statement about whether the force of friction actually does work on the block, as the block slides down the plane Select one: a. Work done by friction is equal to zero. b. Work done by friction is greater than zero. c.Work done by friction is less than zero d. D

Explanation / Answer

Kinetic Friction will act opposite to the velocity of body or we can say that angle between displacement and kinetic friction will be 1800 ..

and work = f.s

work will be negative or we can say less then zero..

Option C is correct answer.

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