First slide

Friction on horizontal surface

Question

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

Easy

A

> g/a
B

< g/a
C

= g/a
D

> a/g

Solution

For block mg = f and N = ma
But $f \leq μN, so mg \leq μma \Rightarrow μ \geq g / a$

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