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

2. 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’

3. What is Pressure ?

4. Pressure and Particles

5. Pressure increases with depth.

6. 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.

7. Hydraulic Jack
You Tube: Hydraulic Jack Experiment

8. 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.

9. Construct Hydraulic Jack
Weights
1) Why is this an efficient machine or why does it make work easier ?
2) Why is it important to remove all air from the system ?
Platform resting on BIG syringe.

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

11. Crampons, small area – BIG PRESSURE

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