Pressure and Fluids IGCSE Physics: Complete Guide
Pressure and Fluids IGCSE Physics: Complete Guide
💧 Understanding Pressure and Fluids in IGCSE Physics
Pressure and fluid mechanics are important physics concepts. This guide covers pressure calculations, buoyancy, and fluid behavior.
🧠 Memory Tips
Pressure Formula: “Force Area”
- P = F/A (Pressure = Force/Area)
- Smaller area = Higher pressure
Archimedes Principle: “Upthrust Equals Weight Displaced”
- Buoyant force = Weight of fluid displaced
📚 Key Concepts
Pressure
- Definition: Force per unit area
- Formula: P = F/A
- Units: Pascal (Pa), N/m²
- Applications: Hydraulics, pneumatics
Pressure in Liquids
- Increases with depth: P = ρgh
- Same at same level: Horizontal surfaces
- Atmospheric pressure: 101,325 Pa at sea level
- Applications: Dams, submarines
Archimedes Principle
- Upthrust: Upward force on submerged object
- Equals: Weight of fluid displaced
- Floating: Upthrust = Weight of object
- Sinking: Upthrust < Weight of object
Applications
- Hydraulic systems: Force multiplication
- Ships: Displacement and buoyancy
- Balloons: Hot air less dense than cold air
- Submarines: Ballast tanks control buoyancy
🎯 Exam Focus
Common Questions:
- Calculate pressure using P = F/A (3 marks)
- Explain Archimedes principle (5 marks)
- Describe pressure in liquids (4 marks)
- Analyze floating and sinking (4 marks)
Key Formulas:
- P = F/A (Pressure)
- P = ρgh (Liquid pressure)
- Upthrust = ρVg (Buoyant force)
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