A block of mass $2 \,kg$ is kept on the floor. The coefficient of static friction is $0.4$. If a force F of $2.5$ Newtons is applied on the block as shown in the figure, the frictional force between the block and the floor will be ........ $N$
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(a) Applied force $ = 2.5\;N$
Limiting friction $ = \mu mg = 0.4 \times 2 \times 9.8 = 7.84\;N$
For the given condition applied force is very smaller than limiting friction.
$\therefore $ Static friction on a body = Applied force $= 2.5 \,N$
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