A)
B)
C)
D)
Correct Answer: A
Solution :
In this alternative, the box and the surface are in direct contact with each other. Therefore, this system has the maximum frictional force between the box and the surface. As a result, this system will generate the maximum amount heat because of friction. The correct answer is A. Why alternatives B, C and D are wrong: The amount of rolling friction is always less when compared to static friction. Hence, the heat generated because of friction by the systems shown in alternatives B and C will be less as compared to the heat generated because of friction by the system shown in alternative A. In the system shown in alternative D, the surface is covered by a thin layer of oil. The box will slide over this layer. As a result, the friction between the box and the surface will become reduced. Hence, the heat generated in this case will be less.
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