Lesson 1 — Introduction to pressure

Science period 2 — Pressure & density
1 / 15
Slide 1: Tekstslide

In deze les zitten 15 slides, met tekstslides.

Onderdelen in deze les

Science period 2 — Pressure & density

Slide 1 -Tekstslide

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

Pressure?

Density?

Slide 3 -Tekstslide

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 -Tekstslide

Pressure

Density
Force applied to an area
The amount of mass per volume

Slide 5 -Tekstslide

Pressure — A demonstration

Slide 6 -Tekstslide

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

Density

Slide 9 -Tekstslide

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 -Tekstslide

Homework
• The workbook exercises of paragraph 8.1

Slide 11 -Tekstslide

A demonstration

Bernoulli's principle

Slide 12 -Tekstslide

Bernoulli's principle
• Moving air applies less pressure then stationary air.

Slide 13 -Tekstslide

Bernoulli's principle
• Moving air applies less pressure then stationary air.