GCSE Physics (AQA)

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Pressure from a Fluid

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Forces Pressure and pressure differences in fluids

Pressure from a Fluid

4:48 Fluid Pressure
Spec 4.5.5.1.1
Previous Colliding & Sticking Calculations Next The Atmosphere
  • Pressure is a force spread over an area.
  • Forces typically act from a single point, while pressures explain forces spread out from multiple points.
  • Standing on the ground exerts a weight force due to gravity, acting from every point of foot contact, creating pressure.
  • Fluids exert pressure on their containers.
  • Gases exert pressure due to collisions between gas particles and container walls.
  • Gas particles move freely, frequently colliding with walls, creating outward pressure.
  • Liquid particles exert pressure on the base of a container due to their weight.
  • Liquid particles are joined but can move and flow, fitting a container.
  • Liquid particles fall to the bottom, creating pressure on the base.
  • Particles above increase pressure on the base by pushing down.
  • Liquid pressure acts not only downwards but also sideways due to particle arrangement.
  • Sideways forces push particles at the walls outward, causing outward pressure.
  • Both gas and liquid pressures act at right angles to the walls.
  • Fluids exert pressure on submerged objects, creating inward pressure.
  • Gas particles colliding with objects create inward pressure.
  • Liquid particles press against submerged objects, creating inward pressure.

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