MCAT Physics Question 28: Answer and Explanation
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Question: 28
13. Mechanical advantage and efficiency are both ratios. Which of the following is true regarding the quantities used in these ratios?
- A. Mechanical advantage compares values of work; efficiency compares values of power.
- B. Mechanical advantage compares values of forces; efficiency compares values of work.
- C. Mechanical advantage compares values of power; efficiency compares values of energy.
- D. Mechanical advantage compares values of work; efficiency compares values of forces.
Correct Answer: B
Explanation:
Mechanical advantage is a ratio of the output force generated given a particular input force. Efficiency is a ratio of the useful work performed by a system compared to the work performed on the system.