Why does pressure change with depth ? How is pressure calculated ?

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Presentation transcript:

Why does pressure change with depth ? How is pressure calculated ? Pressure in Fluids Why does pressure change with depth ? How is pressure calculated ?

ALL MOST SOME SP14 Pressure in Fluids Definition: Pressure is caused by the force of molecules acting on a surface. How confidently can you answer the ALL, MOST, SOME? ALL MOST SOME Explain how pressure is caused and relate to force and area. Grade 4 Investigate a hydraulic system and use P=F/A Grade 4/5 Use P=F/A, and re-arrange equation. Grade 5+ RESOURCES Keywords Edexcel GCSE Physics book GCSE Science Dictionary Student Lab Books Each other Teacher Pressure, force, area, molecules, surface, Pa, N/m2 ‘exploring the possibilities’

What is Pressure ?

Pressure and Particles

Pressure increases with depth.

Hydraulics Hydraulic systems use a fluid to transmit a force from one place to another. A small force (push) can be transmitted into a BIG FORCE. Think about fork lift trucks, hydraulic jacks and diggers.

Hydraulic Jack You Tube: Hydraulic Jack Experiment

Construct Hydraulic Jack Task 1: Build a hydraulic system from 2 syringes, water (fluid) and tubing. Move the BIG SYRINGE by pushing the small syringe.

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Pressure = Force / Area F P A Pressure = Pascals = Pa Force = Newtons = N Area = square meters = m2 F Force P Pressure A Area

Crampons, small area – BIG PRESSURE

Example Question (L5) A pair of snowshoes have a total area of 0.16 m2. Calculate the pressure under a man with a weight of 900 N.