# Lesson 5

Pressure in liquids
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Slide 1: Tekstslide
NaskMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 28 slides, met tekstslides.

## Onderdelen in deze les

Pressure in liquids

#### Slide 1 -Tekstslide

This lesson
• Recap + demonstration
• Converting units
• Practice exercise

#### Slide 2 -Tekstslide

Learning goals
By the end of this lesson you will be able to:
• Explain what pressure is, name the formula for pressure and do calculation exercises about pressure.
• Explain what weight is, name the formula for weight and do calculation exercises about weight.

• Convert m2 to cm2 and the other way around.
• Convert N/m2 to N/cm2 and the other way around.

Recap

Demonstration

#### Slide 5 -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

What is weight?

#### Slide 7 -Tekstslide

Weight
The magnitude of the force of gravity exerted on a specific object.
Quantity
Unit
Weight
Newton (N)
Mass
kilogram (kg)
gravitational field strength
Newton / kilogram (N/kg)
Weight=massgravitationalfieldstrength
W=mg
Formula

#### Slide 8 -Tekstslide

Calculating weight
A) A man with a mass of 80 kilogram (kg) is carrying a box with a mass of 22,5 kilogram (kg). The gravitational field strength on earth is 9.8 Newton/kilogram (N/kg). Calculate the weight of this man and the box together.

B) On the moon this man's weight would be 165 Newton. calculate the gravitational field strength of the moon

Converting units

#### Slide 10 -Tekstslide

Converting units
Converting m2 to cm2
Converting N/m2 to n/cm2

#### Slide 11 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 12 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 13 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 14 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 15 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 16 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 17 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 18 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 19 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 20 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 21 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 22 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 23 -Tekstslide

Converting units
Exercise 1
• 1 cm2 = 0.0001 m2
• 1 m2 = 10000 cm2
• 5 cm2 = 0.0005 m2
• 5 m2 = 50000 cm2
• 0,1 m2 = 1000 cm2
• 0,1 cm2 = 0,00001 m2
Exercise 2
• 1 N/cm2 = 10000 N/m2
• 1 N/m2 = 0,0001 N/cm2
• 5 N/cm2 = 50000 N/m2
• 5 N/m2 = 0,0005 N/cm2
• 0,1 N/m2 = 0,00001 N/cm2
• 0,1 N/cm2 = 1000 N/m2

#### Slide 24 -Tekstslide

Converting units
Exercise 1
a) 1 m2 = 10000 cm2
b) 5 m2 = 50000 cm2
c) 0,5 m2 = 5000 cm2
d) 0,1 m2 = 1000 cm2
e) 1 cm2 = 0,0001 m2
f) 5 cm2 = 0,0005 m2
g) 0,5 cm2 = 0,00005 m2
h) 0,1 cm2 = 0,00001 m2
Exercise 2
a) 1 N/m2 = 0,0001 N/cm2
b) 5 N/m2 = 0,0005 N/cm2
c) 0,5 N/m2 = 0,00005 N/cm2
d) 0,1 N/m2 = 0,00001 N/cm2
e) 1 N/cm2 = 10000 N/m2
f) 5 N/cm2 = 50000 m2
g) 0,5 N/cm2 = 5000 N/m2
h) 0,1 N/cm2 = 1000 N/m2

#### Slide 25 -Tekstslide

Calculating pressure
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 in N/m2.

c) Calculate the pressure the elephant applies to the ground N/m2.
P=AF
W=mg

#### Slide 26 -Tekstslide

Homework
• The exercise in the previous slide (uploaded on somtoday)
• The workbook exercises of 8.2

#### Slide 27 -Tekstslide

Learning goals
By the end of this lesson you will be able to:
• Explain what pressure is, name the formula for pressure and do calculation exercises about pressure.
• Explain what weight is, name the formula for weight and do calculation exercises about weight.

• Convert m2 to cm2 and the other way around.
• Convert N/m2 to N/cm2 and the other way around.