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The contact force exerted by a body A on another body B is equal to the normal force between the bodies. We conclude that
(a) the surfaces must be frictionless
(b) the force of friction between the bodies is zero
(c) the magnitude of normal force equals that of friction
(d) the bodies may be rough but they don’t slip on each other.

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An Intiative by Sri Chaitanya

a and c are true

a, b and d are true

b and d are true

all are true

answer is C.

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Detailed Solution

When the contact force is equal to the weight of the block, we can conclude that the frictional force acting is zero.

And the bodies may be rough but there is no slipping tendency between the blocks.

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