- an empty jar with a lid
- a second jar, filled to the top with water, and a tight-fitting lid
- a large three-ring binder, or other ramp
- Twist the lids tightly onto the 2 jars.
- Move them to the top of the binder, resting them on their sides.
- Release them at the same time, and watch them go! Which jar races ahead?
Which jar rolled faster along the table top?