Question: Kate is at the movies and drops her cup on the floor accidentally. The cup rolls away through the concrete floor in 3 secs which is 25 centi-meters long, but it covered 0.18 meters in 3 secs secs once it hits the carpeted floor. The cup was faster on the concrete floor because the concrete floor had? 
Option 1: more friction
Option 2: less friction.
Answer: Option 2