First slide

Friction on horizontal surface

Question

A block of mass m is placed in contact with another block of mass M as shown in fig. The
coefficient of friction between the blocks is µ. With what acceleration the block M should move so that the block m does not slide down ?

Easy

A

µ g
B

g/µ
C

µ²g
D

g/µ²

Solution

The block will not slide down if
$\begin{array}{l} mg = μma \\ ∴ a = g / μ . \end{array}$

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