Question

what does friction have to do with roller coasters?

Explanation:

Friction affects roller - coaster speed and motion. It opposes the motion of the coaster, reducing its speed over time. Friction occurs between the wheels and the track, as well as between the coaster and the air. It also helps in braking systems to slow down or stop the coaster safely.

Answer:

Friction opposes the motion of the roller - coaster, reducing its speed, and is involved in braking systems for safety.