# Lesson 1 — Introduction to pressure

Science period 3 — Pressure & density
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Slide 1: Tekstslide

In deze les zitten 13 slides, met tekstslides.

## Onderdelen in deze les

Science period 3 — Pressure & density

Pressure?

Density?

#### Slide 2 -Tekstslide

Pressure? Density?
Question 1
• Where do you hear the word pressure used in everyday life?
• What is pressure?

Question 2
• Where do you hear the word density used in everyday life?
• What is density?

Pressure

Density

#### Slide 5 -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 6 -Tekstslide

Pressure — A demonstration

#### Slide 7 -Tekstslide

Exercise
• In pairs of two
• You may use one phone per pair
• What is pressure?

• What is the formula for pressure?

• Where and how is pressure made use of in daily life or technology?
• What is density?

• What is the formula for density?

• Where and how is density made use of in daily life or technology?

#### Slide 8 -Tekstslide

A demonstration

Bernoulli's principle

#### Slide 9 -Tekstslide

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

#### Slide 10 -Tekstslide

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

#### Slide 12 -Tekstslide

What will be covered this period?
•  8.1 up to and including 8.9
• We won't cover 8.7