Question

Question 4. Work done by friction
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Answer 1

Answer:

Since the motion of the body can be placed in the direction of friction, opposite to the direction of motion and even can not be placed any motion.

So, Work done by force of friction can be zero, negative, and can be positive.

Explanation:

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Answer 2

Answer:

The work done by friction is force of friction time the distance traveled times is the cosine of angle between the friction force and displacement...