Kinetic friction is the force that opposes the relative motion between two surfaces in contact when they are moving past each other. It acts parallel to the surfaces and opposite to the direction of motion.
5 Must Know Facts For Your Next Test
The coefficient of kinetic friction ($\mu_k$) is usually less than the coefficient of static friction ($\mu_s$).
The force of kinetic friction can be calculated using $f_k = \mu_k N$, where $N$ is the normal force.
Kinetic friction depends on both the nature of the surfaces in contact and their relative speed.
Unlike static friction, kinetic friction remains constant regardless of the applied force once motion starts.
In problems involving inclined planes, kinetic friction plays a crucial role in determining acceleration.