Do now! Can you complete any unfinished calculations from last lesson??
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Transcript of Do now! Can you complete any unfinished calculations from last lesson??
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.
Density of regular shapes
volume = length x width x height
density = mass/volume
mass using a scale
lengthwidth
height
Density of liquids
Mass of liquid and cylinder
Mass of cylinder
Mass of liquid
Density = mass/volume
Volume
Density of irregular shapes (1)
Difference in level gives the volume of the shape
mass
Density = mass/volume
Oh no!
http://wm-od.cdn.turner.com/cnn/big/bestoftv/2007/04/06/roberts.the.shot.cnn.ws.wmv
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?
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