Which of the following statements about power is true?
Practice Questions
1 question
Q1
Which of the following statements about power is true?
Power is always conserved
Power can be negative
Power is independent of time
Power is a scalar quantity
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.
Questions & Step-by-step Solutions
1 item
Q
Q: Which of the following statements about power is true?
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.
Steps: 4
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.
