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Question
Which of the following statements is correct?
Options
Work done by static friction is always zero.
Work done by kinetic friction is always negative.
Potential energy decreases when conservative force does Positive work.
Work-energy theorem is Valid only for newtonian frames.
MCQ
Solution
Potential energy decreases when conservative force does Positive work.
Explanation:
Work done by conservative force, Wc = -ΔU
If Wc is positive, then ΔU negative.
So, the potential energy decreases.
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Types of Forces
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