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Which of the following statements about power is true?

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Question: Which of the following statements about power is true?

Options:

  1. Power is always conserved
  2. Power can be negative
  3. Power is independent of time
  4. Power is a scalar quantity

Correct Answer: Power can be negative

Solution: 

Power can be negative when work is done against the direction of motion, such as in friction. Therefore, the correct statement is that power can be negative.

Which of the following statements about power is true?

Practice Questions

Q1
Which of the following statements about power is true?
  1. Power is always conserved
  2. Power can be negative
  3. Power is independent of time
  4. Power is a scalar quantity

Questions & Step-by-Step Solutions

Which of the following statements about power is true?
Correct Answer: Power can be negative.
  • Step 1: Understand what power means. Power is the rate at which work is done or energy is transferred.
  • Step 2: Know that work can be done in different directions. When work is done in the same direction as motion, power is positive.
  • Step 3: Learn that when work is done against the direction of motion, like in the case of friction, power can be considered negative.
  • Step 4: Conclude that since power can be negative when work is done against motion, the statement that power can be negative is true.
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