1.

Which of the following is INCORRECT in the laws of dry friction?

A. The magnitude of the limiting friction bears a constant ratio to the normal reaction between the two contacting surfaces
B. The force of friction is dependent of the area of contact between the two surfaces
C. The frictional force always acts in a direction opposite to that in which the body tends to move
D. The force of friction depends upon the roughness/smoothness of the surfaces
Answer» C. The frictional force always acts in a direction opposite to that in which the body tends to move


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