Here's what they did:
- Sandra and Jason - found the coefficient of kinetic friction between an air track and its glider, sans air!
- Danica and Steven - predicted how far a cart would roll down the ramp before being stopped by a spring
- Kati and Jayme - also determined the coefficient of kinetic friction between an air track glider and an air track, without the air on.
Extra fun: why do you think that Jason's and Sandra's coefficient of friction was higher than Kati's and Jayme's? Both are perhaps surprisingly high, but the track really stopped the carts surprisingly quickly! Add your favorite theory in the comments!