A block of mass 4 kg, kept on rough surface is being pulled by applying a horizonatal force of 5N, as shown in the figure. The coefficient of static friction between block and the surface is 0.2. The friction foce acting on the block is-
8N
5N
2N
10N
Solution-
Given-
mass of the block, m=4 kg,
Coefficient of the static friction,
Driving force on the block, F=5N
Let the friction force on the block be f as shown in the diagram-
From F.B.D-
Limiting friction-
As the applied driving force on the block is less than limiting friction the block will remain at rest. In such cases static friction acts of magnitude equal to applied force.
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