The value of work done by the spring force may be:
Correct answer: A. All of these
- A. All of these
- B. Zero
- C. Positive
- D. Negative
Explanation
The work done by the spring force can be positive, negative, or zero depending on the direction of motion and position of the particle. When the particle moves towards the mean position from an extreme position, the work done is positive because the force and displacement are in the same direction. Conversely, when moving from the mean position to an extreme position, the work done is negative as the force opposes the motion. However, over a complete cycle, the net displacement is zero, and thus the net work done is zero. Therefore, all options are possible, making 'All of these' the correct answer.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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About Potential Energy
Potential energy is energy stored because of position or configuration, including gravitational potential energy near Earth's surface and elastic energy in a stretched or compressed spring. Questions use changes in potential energy and conservation of mechanical energy, while distinguishing a chosen reference level from an absolute zero of energy.
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