First slide

Friction on horizontal surface

Question

A man is running on ground the coefficient of friction between man and ground is $Î¼$ . Assume that the center of mass of man moves horizontally Then which statement is incorrect :

Moderate

A

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

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

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

Maximum acceleration of man can be $Î¼ g$

Solution

When a man runs on the ground he applies a force backward direction friction prevents the motion in the backward direction by acting in the forward direction and its maximum applied force is ma, must be equal to $Î¼ m g$ hence maximum acceleration will be $Î¼ g$ .

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