Mon Prof Augmenté
Rocks gather into a ball
Age 11 · Physics
Small rocks and dust drift around a center in space. They move closer and closer until they press together into a round ball.
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Age 11: open this week
Browse Age 11
In the picture
- A smooth round ball: tightly packed material at the center
- A small loose rock: drifting near the center
- A curved trail: a path bending toward the center
Examples
- A snowball rolling in wet snow collects more snow and becomes rounder.
- A ball of clay squeezed in your palm becomes smooth and spherical.
Key takeaways
- Gravity pulls matter toward a center.
- Packed material can form a round sphere.
Quiz: Rocks gather into a ball (Age 11)
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What pulls loose rocks and dust toward a center?
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What happens to small rocks and dust as they move closer to a center?
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What shape can tightly packed material form?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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