Cette leçon contient 15 diapositives, avec diapositives de texte.
Éléments de cette leçon
Science period 2 — Pressure & density
Slide 1 - Diapositive
What will be covered this period?
8.1 Pressure
8.2 The effects of pressure
8.3 Pressure in liquids
8.4 Using pressure in liquids
8.5 Pressure in gasses
8.6 Pressure, volume, and temperature in gasses
8.8 Density
8.9 Explaining density
Slide 2 - Diapositive
Pressure?
Density?
Slide 3 - Diapositive
Pressure?Density?
Question 1
What do you think about when you hear pressure?
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?
Slide 4 - Diapositive
Pressure
Density
Force applied to an area
The amount of mass per volume
Slide 5 - Diapositive
Pressure — A demonstration
Slide 6 - Diapositive
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
Slide 7 - Diapositive
Density
Slide 8 - Diapositive
Slide 9 - Diapositive
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.
Slide 10 - Diapositive
Homework
Read paragraph 8.1
The workbook exercises of paragraph 8.1
Slide 11 - Diapositive
A demonstration
Bernoulli's principle
Slide 12 - Diapositive
Bernoulli's principle
Moving air applies less pressure then stationary air.
Slide 13 - Diapositive
Bernoulli's principle
Moving air applies less pressure then stationary air.
