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Materials needed:
- Random objects to test if they sink or float
- A container filled with water
- Assorted Legos to build their boats
- Pennies to test the density
Experiment:
Start by explaining that you will be playing a game called sink or float.
Give children 10 seconds to choose an item from the room and bring it to you, then set a timer or count to 10 while the children choose their items.
As a group, sort the items into a “sink” pile and a “float” pile, then test the items in a container of water to see if the predictions were correct.
You might also consider asking questions like:
- What are the characteristics or features of objects that float?
- What are the characteristics or features of objects that sink?
- What would happen if you place an object that sinks on top of an object that floats?
Discuss what makes a boat float and come up with an initial design. Depending on the age, they can simply draw their plans or for older kids, have them write why they chose a specific design.
Next, have them construct their boats from legos.
Test whether their boats sink or float.