The contact force exerted by a body $A$ on another body $B$ is equal to the normal force between the bodies. We conclude that:

the surfaces must be frictionless

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the force of friction between the bodies is zero

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the magnitude of normal force equals that of friction

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the bodies may be rough but they don't slip on each other

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Solution

The correct options are
B the bodies may be rough but they don't slip on each other
D the force of friction between the bodies is zero
Generally with friction the contact force, $F_{c} = μ N$
but here $F_{c} = N,$ so there in no friction force between the block. Otherwise they may not slip on each other.

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Similar questions

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 surface must be frictionless
(b) the force of friction between the bodies is zero
(c) the magnitude of normal force equal that of friction
(d) the bodies may be rough but they don't slip on each other.

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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:

The correct options are B the bodies may be rough but they don't slip on each other D the force of friction between the bodies is zeroGenerally with friction the contact force, Fc=μNbut here Fc=N, so there in no friction force between the block. Otherwise they may not slip on each other.

The contact force exerted by a body $A$ on another body $B$ is equal to the normal force between the bodies. We conclude that: