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Understanding upthrust in floating and sinking

Forces and motion • Pressure in fluids

Key concepts

What you'll likely be quizzed about

  • Upthrust is a buoyant force acting in opposition to the weight of an object submerged in a fluid.
  • This force arises from pressure differences in the fluid.
  • The pressure at a given depth in a fluid increases with depth due to the weight of the fluid above it, creating a net upward force on any object in that fluid.

Flashcards

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What causes sinking?

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Sinking occurs when an object's weight exceeds the upthrust from the fluid, leading to a downward movement.

Key notes

Important points to keep in mind

Upthrust equals weight of displaced fluid.

Lighter materials float; heavier ones sink.

Archimedes' principle applies to all fluids.

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