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Airbag Above the Snow

A skier’s backpack inflates into a big balloon in about two seconds. With more volume, the moving snow lifts the skier instead of burying them.

In the picture

  1. The inflated balloon on the skier’s back
  2. The shoulder harness over the jacket
  3. The skier’s helmet above the sliding snow
  4. Snow granules streaming under the balloon

Examples

  • A life jacket keeps a swimmer on top of rough water.
  • Shaking a cereal box makes the big pieces rise to the top.

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Three questions on this lesson. It has left the free week, so its quiz is for subscribers.

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Physics, Age 12