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Understanding Pressure: Calculations and Global Warming Awareness

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This document explores the concept of pressure, demonstrating how to calculate it using real-life examples. It features calculations for pressure under a woman's and a man’s feet based on their weight and shoe area. Students are encouraged to calculate their own pressure and consolidate their learning with homework that involves designing a poster on global warming. The poster should present eye-catching facts either warning about global warming or disputing its existence. Homework is due on Wednesday, 25th March.

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Understanding Pressure: Calculations and Global Warming Awareness

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  1. Do now! Can you stick the summary and target sheets in please?

  2. Oh no! http://wm-od.cdn.turner.com/cnn/big/bestoftv/2007/04/06/roberts.the.shot.cnn.ws.wmv

  3. Spread the force over a greater area

  4. Camels

  5. Snow shoes

  6. Caterpillar tracks

  7. House foundations

  8. I had a dream

  9. Death?

  10. Sharp?

  11. Drawing pins

  12. Pressure N Pressure = Force Area N/m2 or Pa m2

  13. Pressure F N Pressure = Force Area P A x Can you copy this please? N/m2 or Pa m2

  14. An example A woman of weight 600N and one of her shoes has an area of 150 cm2 A man of mass 750 N has a shoe area of 360 cm2 (one shoe). What is the pressure beneath their feet?

  15. An example A woman of weight 600N and one of her shoes has an area of 150 cm2 A man of mass 750 N has a shoe area of 360 cm2 (one shoe). What is the pressure beneath their feet? Angelina pressure = force/area = 600/(2 x 150) = 2 Pa Brad pressure = force/area = 750/(2 x 360) = 1.05 Pa

  16. Calculating your own pressure

  17. Calculating your own pressure Can you do the calculations carefully and neatly on the graph paper to show your pressure (don’t forget you have two feet!) and stick it in your book

  18. Homework • You are going to design a poster either • Warning about global warming and its consequences Or 2. Saying that global warming is not happening and that it is a myth Your poster has to include at least 3 facts, and be eye-catching Due Wednesday 25th March

  19. Pressure under a car

  20. Pressure under a car • Mass = 2000kg • Weight = mg = 2000x10 = 20000N • Area = ? • Pressure = ?

  21. Let’s try some questions! Pages 154 and 155

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