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🔬 Science - Class 10
Unit 8 · Floatation

Upthrust Presentation

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Science and Technology, Grade 10 · Unit 8

Upthrust

Floating and sinking · Real and apparent weight · U = W1 - W2

By the end of this lesson you can

🧪

Define upthrust and give its SI unit

⚖️

Compare weight and upthrust to explain sinking, rising and floating

🧊

Explain why upthrust acts upward

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Calculate upthrust using U = W1 - W2

Try it
Push an empty bottle into water
SEAL
Cap an empty plastic bottle tightly
DROP
Put it in a bucket of water: it floats
PUSH
Press it under and feel it push back
RELEASE
Let go: it shoots back to the surface

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Presenter notes: Hold up an empty bottle with the cap on. Ask: if I drop this in air it falls, so why does it float on water? Today we find the force that answers that.