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A crate dragged across a rough floor loses mechanical energy because friction is:
AConservative
BPerpendicular
CNegligible
DNonconservative
Answer & Solution
Correct answer: D. Nonconservative
1. The class of force decides whether energy can be recovered.
2. Forces are either conservative or nonconservative.
3. Mechanical energy is conserved when only conservative forces are involved.
4. Friction is treated as a nonconservative force.
5. So dragging a crate over a rough floor does not conserve mechanical energy.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 7 'Work, Energy, and Energy Resources', sections 7.1-7.9_
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