First slide

Friction on horizontal surface

Question

An eraser weighing 2N is pressed against the black board with a force of 5N. The coefficient of friction is 0.4. How much force parallel to the black board is required to slide the eraser upwards

Moderate

A

2N
B

2.8N
C

4N
D

4.8N

Solution

$F^{1} = f_{s} + mg, f_{s} = μF here f_{s} = 0.4 \times 5 = 2 N mg = 2 N when it moves up both the forces acts downwards so upward force required = 4 N$

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