Power is dot product of:
Correct answer: B. Force and velocity
- A. Force and displacement
- B. Force and velocity
- C. Force and time
- D. Work and time
Explanation
Power (P) is calculated as the dot product of force (F) and velocity (v), which represents the rate at which work is done.
This question appeared on the NUMS 2023 paper, which you can sit online with every answer explained.
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About Power
Power is the rate at which work is done or energy is transferred, with average power calculated over a time interval and instantaneous power found from P = Fv when force and velocity are aligned. Work includes units, mechanical efficiency, and the distinction between power and total work or energy.
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