Mon Prof Augmenté
Balls Flying from a Cliff
Age 11 · Physics
A hand throws balls sideways from a high cliff. Slow balls land soon, but faster balls travel farther and can curve all the way around the planet.
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Every lesson is open to everyone for 7 days after it is published. This one came out on September 23, 2026: its text stays readable here, and its picture opens with a subscription.
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Age 11: open this week
Browse Age 11
In the picture
- Short dashed arc: a ball falls to the ground near the cliff.
- Longer dashed arc: a faster ball crosses the horizon before landing.
- Long curved path: the fastest ball keeps bending around the planet.
Examples
- A basketball thrown toward a hoop arcs down to the floor.
- Water from a hose arcs down to the garden.
Key takeaways
- Horizontal speed makes a falling path stretch farther.
- With enough speed, a falling object can keep curving around a planet instead of hitting it.
Quiz: Balls Flying from a Cliff (Age 11)
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What does more horizontal speed do to a falling ball’s path?
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What can a falling object do if it has enough horizontal speed?
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What happens to a slow ball thrown sideways from the cliff?
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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