First slide

Static friction

Question

A block of mass 2 kg is kept on the floor. The coefficient of static friction is 0.4 If a force F of 2.5 N is applied on the block as shown in fig.
the frictional force between the block and the floor will be

Moderate

A

2.5 N
B

5 N
C

7.84 N
D

10 N

Solution

The limiting friction is given by
$μR = μ \times mg = 0 \cdot 4 \times 2 \times 9 \cdot 8 = 7 \cdot 84 N$
As the applied force (2.5 N) is less than the limiting friction, therefore in this case, the friction should be equal to 2.5N itself.

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