What is friction?

The video explains why cars skid on icy roads, focusing on the concept of friction. Friction is a force that acts in the opposite direction of movement, slowing objects down. The amount of friction depends on the surface type; smooth surfaces create less friction, while rough surfaces create more. On icy roads, the surface becomes smoother, reducing friction and increasing the likelihood of skidding.

What new insight or understanding did you gain from this video?