Question

question 10 of 10 which of the following would cause the force of kinetic friction to increase? a. a decrease in the normal force b. an increase in μs c. an increase in the normal force d. a decrease in μk

Explanation:

The formula for the force of kinetic friction is $F_{k}=\mu_{k}N$, where $\mu_{k}$ is the coefficient of kinetic friction and $N$ is the normal force. From this formula, we can see that the force of kinetic friction is directly proportional to the normal force and the coefficient of kinetic friction. An increase in the normal force ($N$) will cause an increase in the force of kinetic friction. $\mu_{s}$ is the coefficient of static - friction and is not relevant here. Decreasing $\mu_{k}$ or the normal force will decrease the kinetic - friction force.

Answer:

C. An increase in the normal force