Cereal: Sink or Swim?
Why does some cereal float and some sink? This activity challenges children to investigate how different objects behave in liquids. They'll make predictions, conduct tests, and discover the science behind floating and sinking with everyday breakfast items.
The lesson goal is learners will understand why some objects float and others sink by observing, predicting, and testing their ideas. They will be able to explain the basic concept of density using their own words after conducting fun experiments with everyday cereal.
What You Need
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Learning Guide
Step-by-step guidance. No preparation required.
- 1
Breakfast Table Challenge5 Min
- Ask: 'What do you notice your cereal doing in the milk right now?'
- Move on when Child has observed cereal in milk and expressed initial thoughts or questions.
Photo by cottonbro studio on Pexels - 2
Explore & Plan: Float or Sink?8 Min
- Fill one clear cup with water, another with milk.
- Lay out cereals and small objects next to paper and pencil.
- Ask: 'Which of these do you think will float in water, and which will sink? Why?'
- Move on when Child has made a prediction for each item in both water and milk.
Photo by Chris Flaten on Pexels - 3
Why Does it Float? Why Does it Sink?6 Min
- Ask: 'What was surprising about what you saw with your cereal?''
- Move on when Child can explain density in their own words and relate it to floating/sinking, applying it to a new example.
Photo by Andreas Ebner on Pexels - 4
Test Your Density Theory!9 Min
- Carefully place one piece of dry cereal into the water. Observe.
- Repeat with the same cereal in the milk. Compare results.
- Test other cereal types and small objects in both liquids.
- Ask: 'Did your prediction match? What does this tell us about density?'
- Move on when Student has tested all items in both liquids and noted the outcomes.
Photo by Sergey Meshkov on Pexels - 5
The Science of Breakfast2 Min
- Ask: 'What was your favorite part of being a density scientist today?'
- Move on when Student shares one key takeaway or connection to the real world.
Photo by "Beyond India by Shubham Thakur" on Pexels
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