Block A of mass 2 kg was pressed against a vertical wall with block B of mass 1 kg as shown. Coefficient of static friction between all the surfaces in contact is 0.5. The frictional force on A it is prevented from sliding is B
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Static friction is the force that keeps the object at rest. It must be overcome to start moving the object. If a small amount of force is applied to an object, the static friction has an equal magnitude in the opposite direction.
Coefficient of friction (μ)=0.3
Normal force=100N
So, f
max
(Maximimfrictionforce)=100×0.3
=30N
Force trying to produce motion =mg=2×10=20N
So, frictional force =20N
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