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Description

Children predict and test whether different objects sink or float in water. By observing the results, they begin to understand buoyancy—the upward push of water that helps some objects float.

Resources

- Tray, tub, or large bowls filled with water
- 5–6 objects to test (e.g., rock, metal spoon, sponge, cork, plastic lid, rubber ball, coin)
- Sink‑or‑float prediction worksheet
- Towels for spills
Optional: Aprons or waterproof smocks for children

Instructions

1. Set Up the Water Tray
Fill a tray or bowl with water and gather all the objects you’ll be testing.
2. Introduce the Activity
Show children two different objects (e.g., a rock and a sponge). Ask what they think will happen when each is placed in the water.
3. Make Predictions
Show all 5–6 objects.
Ask children to give a thumbs up if they think the object will float or thumbs down if they think it will sink.
Encourage simple reasoning like “It’s heavy,” or “It feels light.”
4. Test Each Object
Let children take turns placing objects into the water.
After each test, ask:
“What happened?”
“Was your prediction right?”
“Why do you think it sank or floated?”
5. Discuss Patterns
Highlight what they notice, such as:
Heavy objects often sink.
Objects that trap air or are light often float.
6. Wrap Up
Bring children together and ask:
“Which objects floated?”
“Which ones sank?”
Introduce the word buoyancy, explaining that water gives an upward push that helps some objects float.
Optional Extension
Ask if any results were surprising and what new predictions they might make next time.

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