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Do now!. Can you stick the summary and target sheets in please?. Oh no!. http://wm-od.cdn.turner.com/cnn/big/bestoftv/2007/04/06/roberts.the.shot.cnn.ws.wmv. Spread the force over a greater area. Camels. Snow shoes. Caterpillar tracks. House foundations. I had a dream. Death?. Sharp?.

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Do now!

Can you stick the summary and target sheets in please?


Oh no!

http://wm-od.cdn.turner.com/cnn/big/bestoftv/2007/04/06/roberts.the.shot.cnn.ws.wmv


Spread the force over a greater area


Camels


Snow shoes


Caterpillar tracks


House foundations


I had a dream


Death?


Sharp?


Drawing pins


Pressure

N

Pressure = Force

Area

N/m2 or Pa

m2


Pressure

F

N

Pressure = Force

Area

P

A

x

Can you copy this please?

N/m2 or Pa

m2


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?


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


Calculating your own pressure


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


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


Pressure under a car


Pressure under a car

  • Mass = 2000kg

  • Weight = mg = 2000x10 = 20000N

  • Area = ?

  • Pressure = ?


Let’s try some questions!

Pages 154 and 155


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