Which of the following statements concerning friction between the surfaces of tw

Question

Which of the following statements concerning friction between the surfaces of two objects is correct? Select one: a. The force of friction mostly depends on the nature of the two surfaces. b. The force of friction depends soley on the speed that the two surfaces are moving relative to each other. c. The force of friction always varies as the square of the area of contact between the two surfaces. d. The force of friction is dependent on both the speed that the two surfaces are moving relative to each other and the area of contact.

Explanation / Answer

Here,

for the frictional force

, it is not dependent on the contact area, speed of relative motion between the surfaces.

as frictional force = u * N

u is the coefficient of friction which is dependent on nature of surfaces

N is the normal force

hence, the correct option is

a. The force of friction mostly depends on the nature of the two surfaces.

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