Which of the following statements concerning friction is incorrect? Select one:

ID: 1661231 • Letter: W

Question

a. The force that prevents two surfaces from sliding across one another is called static friction.

b. The force of static friction (fs) between parallel surfaces in contact is given by: fs = sN.

c. Sliding or kinetic friction is the force which acts to stop two surfaces from sliding past one another.

d. The force of kinetic friction acts opposite to the direction of motion and is expressed by the following equation: fk = kN.

Option C is incorrect.

When a body is at rest on a surface . The opposing force exerted on a body by a surface is called static friction.

When a body is moving on a surface the opposing force exerted by the surface is called kinetic friction.

The formulas given in option a and d also correct.

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