FrictionMedium
Question
A contact force exerted by one body on horizontal surface is equal to the normal force (≠ 0) between them. It can be said that :
Options
A.the contact surfaces must be frictionless
B.the contact surfaces must be frictionless
C.the force of friction between the contact surfaces is zero
D.It is possible that the bodies are rough and they do not slip on each other.
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