Density, Float or Sink. worksheet - Free Printable

Density Worksheet Solution

Instructions Recap:
- Circle with red the object that will float in water.
- Circle with green the object that will sink in water.

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Understanding Density and Floating/Sinking:

An object will float in water if its density is less than water (1 g/cm³).
An object will sink if its density is greater than water.

Let’s analyze each object:

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1. Feather

- Made of light organic material.
- Very low density.
✔ Floats → Red circle

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2. Dumbbell

- Made of metal (iron or steel).
- Very dense.
✘ Sinks → Green circle

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3. Fork

- Made of metal (steel or silverware alloy).
- Dense.
✘ Sinks → Green circle

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4. Water Bottle (plastic, empty)

- Plastic bottles are typically made of PET, which is less dense than water.
- Even when filled with air, they float.
✔ Floats → Red circle

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5. Beach Ball

- Hollow, filled with air.
- Very low density.
✔ Floats → Red circle

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6. Scissors

- Metal blades and handle.
- High density.
✘ Sinks → Green circle

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7. Pumpkin

- Mostly water and fibrous tissue.
- Density is close to water, but usually slightly less — it floats!
✔ Floats → Red circle

> 📌 Note: A pumpkin may sink if very dense or wet, but generally, a fresh pumpkin floats due to air pockets.

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8. Anvil

- Made of heavy iron/steel.
- Extremely dense.
✘ Sinks → Green circle

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9. Cork

- Natural cork has many air pockets.
- Very low density.
✔ Floats → Red circle

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✔ Final Answers:

#### Circle with RED (Float):
- Feather
- Water Bottle
- Beach Ball
- Pumpkin
- Cork

#### Circle with GREEN (Sink):
- Dumbbell
- Fork
- Scissors
- Anvil

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🟦 Summary Table:

| Object | Floats? | Circle Color |
|----------------|--------|--------------|
| Feather | Yes | Red |
| Dumbbell | No | Green |
| Fork | No | Green |
| Water Bottle | Yes | Red |
| Beach Ball | Yes | Red |
| Scissors | No | Green |
| Pumpkin | Yes | Red |
| Anvil | No | Green |
| Cork | Yes | Red |

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✔ Correctly circled objects:
- Red: Feather, Water Bottle, Beach Ball, Pumpkin, Cork
- Green: Dumbbell, Fork, Scissors, Anvil

This worksheet teaches the concept of density through real-world examples!