Where do you hear the word pressure used in everyday life?
What is pressure?
Question 2
What do you think about when you hear density?
Where do you hear the word density used in everyday life?
What is density?
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Pressure
Density
Force applied to an area
The amount of mass per volume
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Pressure — A demonstration
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Pressure
A measure of force applied to the surface of an object
Quantity
Unit
Pressure (P)
Pascal (Pa)
Force (F)
Newton (N)
Area (A)
m2
Pressure=AreaForce
P=AF
Formula
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Density
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Exercise
A woman weighing 76 kg is wearing high heels to the zoo. She goes to see an elephant with a mass of 5221 kg. One of her heels has a total area of 8.4 cm2. One of the elephants feet has an area of 301 cm2.
a) Without making calculations, make an estimation of wether the elephant or the women applies a greater pressure to the ground. Write down your reasoning.
b) Calculate the pressure the women applies to the ground.
c) Calculate the pressure the elephant applies to the ground.
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Homework
Read paragraph 8.1
The workbook exercises of paragraph 8.1
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A demonstration
Bernoulli's principle
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Bernoulli's principle
Moving air applies less pressure then stationary air.
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Bernoulli's principle
Moving air applies less pressure then stationary air.
