Questions

A man is running on ground. The coefficient of friction between man and ground is 0.25. Assume that the center of mass of man moves horizontally. Then which statement is incorrect :

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Normal reaction between man and ground is equal to weight of man

Direction of friction on man is in the direction of motion of man

Direction of friction on man is opposite to the direction of motion of man

Maximum acceleration of man can be g/4

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detailed solution

Correct option is C

When a man runs on the ground, he applies a force in backward direction. Friction prevents the motion in the backward direction by acting in the forward direction. The maximum applied force is ma, which must be equal to mg4 hence maximum acceleration will be g4.

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