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Science Project: The Paper Napkin Trick Viewed: 3304
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The Paper Napkin Trick

It's a good idea to practice this trick, too, where spilled water won't do any harm.

You need:

  • a paper napkin
  • a plastic cup of water

What to do:

Drape the napkin over the edge of a kitchen coun­ter or table. Place the plastic cup of water on one corner of the napkin about an inch (25 mm) from the edge. Pull the napkin quickly from under the plastic cup.

What happens:

The napkin comes out-without your spilling any water.

Why:

The cup doesn't overturn because of the tendency of things at rest to stay at rest. It's that old law of motion-inertia-at work. If it does spill? You're not pulling the napkin fast enough or with enough force.