GCSE Physics (AQA)

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Upthrust

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Forces Pressure and pressure differences in fluids

Upthrust

2:03 Depth and Atmospheric Pressure
Spec 4.5.5.1.2
Previous Pressure of a Liquid Column Next Floating & Sinking
  • Up thrust is an upward force acting on objects submerged in a liquid.
  • A boat floats on the water's surface and is partially submerged.
  • The boat's weight pulls it down, but up thrust keeps it afloat.
  • Up thrust is experienced by both partially and fully submerged objects.
  • The top and bottom of a submerged object are at different depths in a liquid.
  • Pressure below the object is greater than the pressure above.
  • Pressure is a force spread out over a surface and changes with depth.
  • The weight of the water above increases with depth, exerting greater pressure from below.
  • The resultant up thrust force is due to the pressure difference between vertical forces.
  • Up thrust acts upwards, opposite to weight, as horizontal forces are equal and opposite.
  • In exams, explaining pressure differences can demonstrate how a submerged object experiences up thrust.

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