First slide

Friction on horizontal surface

Question

A duster weighs 0.5N. It is pressed against a vertical board with a horizontal force of 11N. If the co-efficient of friction is 0.5 the minimum force that must be applied on the duster parallel to the board to move it upwards is

Moderate

A

0.4 N
B

0.7 N
C

6 N
D

7 N

Solution

$F_{up} = f + mg, f = μN, N = F$

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