Work Energy And Power Question 301

Question: If only conservative forces are working in the system and we apply some external force

Options:

A) $ W _{ext}=\Delta U $ (always)

B) $ {W _{conservative}}=-\Delta U $ (always)

C) $ W _{ext}=\Delta U+\Delta KE $ (always)

D) $ {W _{conservative}}=-\Delta KE $

Show Answer

Answer:

Correct Answer: B

Solution:

[b] If only conservative forces are acting in the system.

$ \Rightarrow $ $ W _{ext}=\Delta U $ (If body moves without acceleration)

$ W _{ext}=\Delta U+\Delta KE $ (if body moves with acceleration)

$ \Rightarrow $ $ {W _{conservative}}=-\Delta U $ (always)



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