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Question

# A cube is pushed in such a way that it slides on a horizontal surface. How can the frictional force acting on the cube be increased?

A
By adding wheels to the cube
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B
By applying lubricant between the cube and the surface
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C
By polishing the outer surface of the cube
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D
By placing another cube on top of it
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Solution

## The correct option is D By placing another cube on top of itThe frictional force increases with the increase in the force on the contacting surface between two objects. An increase in the weight on the cube will increase the force between the cube and the horizontal surface. Hence, the frictional force will increase.

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