A man thinks to remain in equilibrium by pushing in his hands and feet against two vertical parallel walls as the shown in the figure :
a) He must exert equal forces on both walls
b) The forces of friction at both walls must be equal
c) The coefficients of friction between man and wall must be the same at both ends
d) Friction must be present on both walls

Question

Infinity Learn · Accepted Answer

Normal reaction of walls are horizontal, frictionless forces at walls are vertically upwards, weight of man is vertically downwards. So frictionless forces only can keep the man in equilibrium.Also since the man is also in horizontal equilibrium, normal reactions of walls must be equal.

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