• 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

1. Twist the lids tightly onto the 2 jars.
2. Move them to the top of the binder, resting them on their sides.
3. Release them at the same time, and watch them go! Which jar races ahead?

Which jar rolled faster along the table top?

the air-filled jar
the water-filled jar
they rolled at the same speed

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