MCAT Physics Question 21: Answer and Explanation
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Question: 21
6. In the pulley system shown below, which of the following is closest to the tension force in each rope if the mass of the object is 10 kg and the object is accelerating upwards at 
- A. 50 N
- B. 60 N
- C. 100 N
- D. 120 N
Correct Answer: B
Explanation:
To calculate the tension force in each rope, first draw a free body diagram:
From the force diagram, notice that there are two tension forces pulling the mass up. The net force for this system (Fnet) is equal to 2T – mg. Now we can use Newton's second law:
