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In this simple experiment, students explore density by attempting to make a lump of clay float on top of the water. Students can experiment and continue modifying their shape until it is able to float like a boat! Different shapes can be compared to see which shape floats best.
Grade Level: 2 - 8
Time: 15 - 20 minutes
Learning Standards: PS1.A, PS1.B, MP.7, SL1
What are we learning?
What are we learning?
We are learning that although clay is dense if we manipulate it in a form that will utilize the surface tension then it will float. This is a great way to explain how heavy ships float as well.
Materials needed
Materials needed
Bowl or basin to hold water (large enough to attempt to float your clay)
Modeling clay - 1 lump per participant (large enough to mold into a small "boat" shape
Water
How is it done?
How is it done?
Fill bowl/basin with water about 2/3 full
Distribute lumps of modeling clay to each participant
Start by seeing if the ball of clay sinks or floats (First make a prediction. Then consider why.)
Next return the same ball of clay, and attempt to mold it into a shape that will float. Keep experimenting to see if the shape will sink or float.
What to expect?
What to expect?
Boat-like shapes will float while clay in a ball will sink. There will be variations in between as well.
Extensions
Extensions
Try using different materials such as tinfoil with pennies, or marbles.
Try using household items and foods
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