Work Energy And Power Question 220

Question: Work done by static friction on an object

Options:

A) May be positive

B) must be negative

C) Must be zero

D) None of these

Show Answer

Answer:

Correct Answer: A

Solution:

[a] Consider the blocks shown in the figure to be moving together due to friction between them.

The free body diagrams of both the blocks .

Work done by static friction on A is positive and on B is negative



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