Name each object and think about its material and shape. Predict whether it will sink or float, and explain why. Keep your original predictions so you can compare them with your results.
With a grown-up: An adult stays beside you throughout water play. Use a shallow plastic tub and objects too large to swallow. Avoid glass, sharp objects and items with batteries. Keep your screen dry and away from the water. Do not drink the water. Dry spills and empty the tub when finished.
Read the complete activity guide ↗
Explore before you start.
Open the picture for a closer look, or use the drawing and writing areas below. You can also use paper beside your experiment.
Look beyond size
A large object can float and a smaller one can sink. Consider what it is made of and whether it contains air.
Keep your first idea
Do not change a prediction after testing. Add what you learned to the results diary instead.
Use a finger, stylus or mouse in each drawing box. Type below it, or ask a grown-up to write your words. Your work stays in this tab. Save before refreshing or leaving.
Object 1
Draw your object and say what you think it will do.
Object 2
Draw your object and say what you think it will do.
Object 3
Draw your object and say what you think it will do.
Object 4
Draw your object and say what you think it will do.
Your ideas belong here. There is no score.
What are we learning?
A prediction is an idea we can test. A surprising result is useful evidence, not a wrong answer to hide.
Prefer a worksheet?
Open the individual cartoon activity sheet to print or save. Use portrait orientation and fit to page.
Open worksheet to save ↓Try another little investigation.
Plan Your Sink or Float ExperimentChoose your materials, plan a fair test and draw your setup before you begin.
Draw · Type · Save
My Sink or Float Results DiaryRecord the evidence from four tests. Compare what you expected with what actually happened.
Draw · Type · Save
Sort Your Sink or Float DiscoveriesUse your real results to group objects that sank and objects that floated.
Draw · Type · Save
Build a Foil BoatShape, test and improve a boat made from one piece of foil. Can you keep its inside dry?
Draw · Type · Save