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Do now!

Do now!. Can you complete any unfinished calculations from last lesson??. Last lesson. Calculating density. Density. Remember that density is the mass of one cubic centimetre (or sometime cubic metre) of a substance.

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Do now!

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  1. Do now! Can you complete any unfinished calculations from last lesson??

  2. Last lesson Calculating density

  3. Density Remember that density is the mass of one cubic centimetre (or sometime cubic metre) of a substance. So for example, gold has a density of 19.3 g/cm3. His means one cubic centimetre (cm3) of gold has a mass of 19.3 grams.

  4. The formula! g/cm3 Density = mass volume Or using the formula triangle; m D x V g cm3

  5. Density of regular shapes volume = length x width x height density = mass/volume mass using a scale height width length

  6. Density of liquids Volume Mass of liquid Mass of cylinder Mass of liquid and cylinder Density = mass/volume

  7. mass Density of irregular shapes (1) Difference in level gives the volume of the shape Density = mass/volume

  8. mass Density of irregular shapes (2) Displacement can volume of object Density = mass/volume

  9. I’m worried!

  10. I’m worried! Some more density questions. Homework due for 8th September (Tuesday)

  11. This lesson • Recall and use the relationship between pressure, force and area

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

  13. Spread the force over a greater area

  14. Camels

  15. Snow shoes Tom

  16. Caterpillar tracks

  17. House foundations

  18. Sharp?

  19. I had a dream

  20. Death?

  21. Drawing pins

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

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

  24. An example A woman of weight 600N has a shoe area of 150 cm2 and a man of weight 750 N has a shoe area of 360 cm2. What is the pressure beneath their feet?

  25. An example A woman of weight 600N has a shoe area of 150 cm2 and a man of weight 750 N has a shoe area of 360 cm2. What is the pressure beneath their feet? Angelina pressure = force/area = 600/150 = 4 N/cm2 Brad pressure = force/area = 750/360 = 2.1 N/cm2

  26. Let’s try some questions! Page 63, questions 1 to 4. Can you then write (and answer) 3 questions of your own?

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