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Buoyancy and Flotation Diagnostic
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Buoyancy and Flotation
Part 1: What do you think?
1. What does it mean when an object floats?
2. Why do you think some objects float while other objects sink?
3. Can a heavy object float? Explain your thinking.
4. Why do you think boats float, even though they can be very heavy?
Part 2: Predict, then explain
5. Predict whether each object will float or sink in water. Circle one answer for each object.
Rock
FloatSink
Coin
FloatSink
Sponge
FloatSink
Key
FloatSink
Wooden block
FloatSink
Tennis ball
FloatSink
Plastic bottle
FloatSink
Boat
FloatSink
6. Choose one of your predictions above. Explain why you think it will float or sink.
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