First slide

Static friction

Question

A person just holds a block weighing 2kg between his hands & just keeps it from falling down by pressing it with his hands. If the force exerted by each hand horizontally is 50N, the coefficient of friction between the hand & the block is (g=10ms^–2)

Moderate

A

0.2
B

0.4
C

0.1
D

0.5

Solution

$2\mu N = mg;\;\mu = \frac{{mg}}{{2N}}$
$\mu = \frac{{2 \times 10}}{{2 \times 50}} = \frac{2}{{10}} = 0.2$

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