Simple Science: Will it Sink or Float? - The Chirping Moms - Free Printable

This worksheet is designed to help children predict whether various objects will float or sink when placed in water. It's a fun science activity that introduces the concept of buoyancy, which depends on an object’s density (how much mass it has compared to its volume) and how it interacts with water.

Let’s go through each object and make predictions based on common knowledge and physical properties:

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🔍 Predictions: Will it Sink or Float?

| Name of Object | Float | Sink |
|----------------|-------|------|
| Crayon | ✔ | |
| Pencil | ✔ | |
| Coin | | ✔ |
| Popsicle Stick | ✔ | |
| Toy Car | | ✔ |
| Cotton Ball| ✔ | |
| Marshmallow| ✔ | |

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🧠 Explanation for Each Prediction:

1. Crayon → Float
- Crayons are made of wax, which is less dense than water. Wax doesn’t absorb water easily, so it floats.

2. Pencil → Float
- Pencils are made mostly of wood, which is less dense than water. The graphite core is denser, but overall, the pencil floats because of the wood.

3. Coin → Sink
- Coins are made of metal (like copper or steel), which is much denser than water. Metals sink unless they're hollow or very thin.

4. Popsicle Stick → Float
- Made of wood, which is lighter than water and has air pockets, so it floats.

5. Toy Car → Sink
- Most toy cars are made of plastic or metal. If it’s solid plastic, it might float, but many small toy cars are dense enough to sink. In general, plastic toy cars often sink unless specifically designed to float.

6. Cotton Ball → Float
- Cotton is very light and full of air pockets. Even though cotton absorbs water eventually, it starts by floating due to low density.

7. Marshmallow → Float
- Marshmallows are soft, spongy, and full of air. They are much less dense than water, so they float — though they may dissolve over time.

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💡 Teaching Tip:

You can turn this into a hands-on experiment! Let kids predict first, then test each item in a bowl of water. Compare predictions with actual results to learn about density and buoyancy.

✔ Bonus Science Concept: Objects that are less dense than water float; those more dense sink.

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Let me know if you'd like a printable version or want to add columns for "Actual Result"!