Which of the following statement shows that no work is done?
Correct answer: C. The moon Orbiting the earth.
- A. Pushing a car to start it moving
- B. Lifting the weights.
- C. The moon Orbiting the earth.
- D. Writing an essay on a page.
Explanation
When the moon revolves around the earth, the displacement is normal to the direction of force on the moon. Therefore no work is done by the moon.Work is the dot product of force and displacement.W=F.dcos theta
This question appeared on the UHS MDCAT 2019 paper, which you can sit online with every answer explained.
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About Work
Work is done when a force produces displacement, with its value determined by the component of force along the displacement. The topic covers positive, negative and zero work, work by variable forces from force-displacement graphs, and the connection between net work and change in kinetic energy.
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