Two boxes, having the same weight, are kept between two vertical walls – McqOptions

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1.	Two boxes, having the same weight, are kept between two vertical walls. Calvin lifts one of the boxes (against the pull of gravitational force) with the help of a rope. Before lifting the second box, he lubricates the vertical walls with oil. As a result, he has to apply less force to lift the second box. Which force is reduced as a result of the lubrication of the walls?
A.	Gravitational
B.	Compressive
C.	Frictional
D.	Magnetic
Answer» D. Magnetic

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