How does Dynamic Friction differ from other types of friction?

Dynamic friction specifically refers to the frictional force that is present when two surfaces are in motion relative to each other. This type of friction is crucial in understanding how objects slide past one another once they are already in motion.

When an object begins to move, it overcomes static friction, which is the force that keeps it at rest. Once in motion, the force that opposes this movement is dynamic friction. One of the defining characteristics of dynamic friction is that it typically requires less force to maintain motion compared to static friction, making it easier to keep an object sliding than to initiate that slide. This aspect is why dynamic friction is often associated with smoother and less resistant movement, as once the initial resistance is overcome, the ongoing resistance is reduced.

Thus, the fact that dynamic friction occurs during movement and requires less force to maintain motion accurately highlights its unique role in the mechanics of sliding objects.