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Results so far
Which jar rolled faster along the table top?
Here's how kids have voted so far:
Pie chart representing percentages at right 31% the air-filled jar

44% the water-filled jar

23% they rolled at the same speed

sneak peek
How's it work?
The water-filled jar gets to the bottom of the ramp first, but things start to change when the jars reach the tabletop. The water in the jar rubs against the jar walls, slowing it down. The air-filled jar doesn't experience this friction, and zooms ahead.

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