• a cup
• a sponge
• a table tennis ball
• water

1. Put about an inch of water in the cup. Float the table tennis ball in the water.
2. Hold the cup over the sponge a few inches, and drop it. The ball doesn't bounce out.
3. Try dropping the cup from a bit higher. The ball still doesn't bounce out.
4. Now swirl the cup, then drop it from the original height. The ball jumped out!
5. How else can you get the ball to jump out of the cup?

What made your ball bounce highest?

drop it from higher up
swirl the water first
put more water in the cup

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