Pressure Winds Storms and Cyclones

Study sheet excerpt

Course Outline

  1. Pressure and Force Area Relations
  2. Pressure in Liquids
  3. Atmospheric Pressure
  4. Air Pressure and Wind Formation
  5. High-Speed Winds and Roofs
  6. Storms and Thunderstorms
  7. Lightning and Electrical Safety
  8. Cyclone Formation and Structure
  9. Cyclone Hazards and Protection

1. Pressure and Force Area Relations

Key Concepts & Definitions

  • Pressure : The force acting per unit area, considering forces perpendicular to the surface.

★ Must-know

📐 Formula — Pressure satisfies P=FAP = \frac{F}{A}, where F is force and A is area.

  • A force of 100 N acting on an area of 2 m² produces a pressure of 50 N/m².

📌 Increasing the area over which a force acts reduces pressure, so broad bag straps, broad bucket handles, and cloth rings under loads make carrying more comfortable.

Further detail

  • The SI unit of pressure is the newton per square metre, written N/m², which is also called the pascal and denoted Pa.

Memory Hook

Broad straps spread force; narrow straps concentrate force.

2. Pressure in Liquids

Key Concepts & Definitions

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Quiz preview

1. Which expression defines pressure when a force acts perpendicular to a surface?

2. What is the correct definition of pressure in physics?

3. A force of 100 N acts perpendicular to an area of 2 m². What pressure does it produce?

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Flashcards preview

What is pressure in terms of force and area?

Pressure is force acting per unit area perpendicular to the surface.

Pressure formula

P = F / A. Force per unit area.

What formula expresses pressure using force and area?

Pressure is given by P=FAP = \frac{F}{A} where F is force and A is area.

Unit of pressure

Newton per square metre (Pa).

Why do a pointed nail and knife edge exert greater pressure?

Their smaller contact areas concentrate the applied force.

Liquid pressure increases with

Height of liquid column.

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The quiz contains 11 multiple-choice questions with detailed corrections and explanations for each answer. Ideal for testing your knowledge and identifying gaps.

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