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Mechanical energy transferred into or out of a system equals the work done by an external force with a nonzero component:
ANormal to the displacement
BOpposite to the velocity
CAlong the vertical axis
DParallel to the displacement
Answer & Solution
Correct answer: D. Parallel to the displacement
1. Only part of a force does work on a moving object.
2. Work relates directly to energy transfer.
3. The transfer of mechanical energy equals the work done on the system by an external force.
4. That force must have a nonzero component parallel to the displacement.
5. A force entirely perpendicular to the displacement does no work.
_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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