Upthrust (AQA GCSE Physics): Flashcards

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Upthrust
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What does a submerged object experience?

Pressure from the liquid

Pressure vs depth in liquid

Pressure increases with depth

Surface w/ more pressure: top or bottom

Bottom surface

Upthrust definition

Resultant upward force on submerged object

Direction of upthrust

Upwards

Upthrust equals

Weight of water displaced by object

Condition for object to float

Upthrust equal to or more than object weight

Condition for object to sink

Upthrust less than object weight

Why bottom surface has more pressure

Pressure increases with depth

Property determining sink or float

Density of object

Why higher density objects sink

Displaced water weighs less, so upthrust < weight

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