We can express the kinetic friction law in the form \(\vec{F}_{K F}=\mu_{k} \vec{F}_{N} .

Question

Quizplus · Accepted Answer

The kinetic friction law is expressed as $\vec{F}_{K F}=\mu_{k} \vec{N}$, where $\mu_{k}$ is the coefficient of kinetic friction and $\vec{N}$ is the normal force. The formula given in the question incorrectly suggests that the kinetic friction force is a product of the coefficient of kinetic friction and the normal force vector, but in reality, the kinetic friction force is equal to the coefficient of kinetic friction multiplied by the magnitude of the normal force, and its direction is opposite to the direction of motion.

We Can Express the Kinetic Friction Law in the Form \(\Vec{F}_{K F}=\mu_{k} \Vec{F}_{N}