Mon Prof Augmenté
Falling in Two Tubes
In a tube with no air, a feather and a lead ball fall together. In open air, the feather falls more slowly than the lead ball.
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Age 13: open this week
Browse Age 13
In the picture
- Badge 1 sits on the white feather at mid-height in the sealed left tube.
- Badge 2 sits on the gray lead ball at mid-height in the sealed left tube.
- Badge 3 sits on the gray lead ball near the bottom of the open right tube.
- Badge 4 sits on the white feather near the top of the open right tube.
Examples
- A flat sheet of paper falls more slowly than the same sheet crumpled into a ball.
- A parachute slows a skydiver by catching air.
Key takeaways
- Without air resistance, all objects fall at the same rate.
- Air resistance makes light or wide objects lag behind heavy or compact ones.
Carry on in the app
Three questions on this lesson. It has left the free week, so its quiz is for subscribers.
At least one new illustrated lesson every weekday for your child’s year, with its quiz and a reminder at 6:15 pm.
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