AP Physics 1 Question 446: Answer and Explanation
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4. A 50 kg man stands on a scale that measures force in an elevator traveling up with an acceleration of g/4. What will the scale read?
- A. 375 N
- B. 500 N
- C. 575 N
- D. 625 N
Correct Answer: D
The reading on the scale is equal to the magnitude of the downward force exerted by the man on the scale. By Newton's Third Law, this is equivalent to the magnitude of the normal force exerted by the scale on the man. There are two forces acting on the man: the weight of the man and the normal force of the scale. Apply Newton's Second Law: