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 the figure, 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

Applied force = 2.5 N
Limiting friction = $μmg$ = 0.4 x 2 x 9.8 = 7.84 N
For the given condition applied force is less than limiting friction.
.'. Static friction on a body = Applied force
= 2.5 N

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