First slide

Friction on horizontal surface

Question

A chain lies on a rough horizontal table. It starts sliding when one-fourth of its length hangs over the edge of the table. The coefficient of static friction between the chain and the surface of the table is

Moderate

A

1/2
B

1/3
C

1/4
D

1/5

Solution

Weight of the hanging part is equal to the frictional force on the table.
$\frac{mg}{4} = \frac{3}{4} μmg$
$μ = \frac{1}{3}$

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