First slide

Friction as component of Net Contact Force

Question

A rough vertical board has an acceleration a so that a 2 kg block pressing against it does not fall. The coefficient of friction between the block and the board should be

Moderate

A

> g/a
B

< g/a
C

= a/g
D

> a/g

Solution

$μ R = m g$
$μ m a = m g$
$μ_{\min} = \frac{g}{a}$

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