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Physics-

General

Easy

Question

A block of mass m is pressed against a vertical wall with a horizontal force F=mg. Another force $F to the power of ´ end exponent equals fraction numerator m g over denominator 2 end fraction$ is acting vertically upon the block. If the coefficient of friction between the block and wall is $fraction numerator 1 over denominator 2 end fraction$ , the friction between them is :

$\frac{m g}{2}$ up
$\frac{m g}{2}$ down
mg up
zero

The correct answer is: $fraction numerator m g over denominator 2 end fraction$ up

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