6. An elevator supported by a single cable descends a shad at a constant speed.

Question

6. An elevator supported by a single cable descends a shad at a constant speed. The only forces acting on the elevator are the tension in the cable and the gravitational force. Which one of the following statements is true? A) the magnitude of the work done by the tension force is larger than that done by the gravitational force. B) The magnitude of the work done by the gravitational force is larger than that done by the tension force C) The work done by the tension force is zero joules. D) The work done by the gravitational force is zero joules. E) The net work done by the two forces is zero joules.

Explanation / Answer

the answer is E. since the speed is constant, then net force would be equal to zero, from newtons first law of motion, and work is define as net force *displacement, then therefore net work is zero also. A and B is not possible, because these are only true if an elevator is accelerating D and C is not possible also, since both the cable and the elevator are interacting with each other, they should exert force, the tension and the weight, thus they are doing work to their counterpart.

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