MCAT Physics Question 4: Answer and Explanation
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Question: 4
4. An elevator is designed to carry a maximum weight of 9800 N (including its own weight), and to move upward at a speed of 
after an initial period of acceleration. What is the relationship between the maximum tension in the elevator cable and the maximum weight of the elevator while the elevator is accelerating upward?
- A. The tension is greater than 9800 N.
- B. The tension is less than 9800 N.
- C. The tension equals 9800 N.
- D. It cannot be determined from the information given.
Correct Answer: A
Explanation:
The forces on the elevator are the tension upward and the weight downward, so the net force on the elevator is the difference between the two. For the elevator to accelerate upwards, the tension in the cable will have to be greater than the maximum weight so that there is a net force directed upwards.