# Lesson 6

This lesson
• Converting m2 to cm2
• Worksheet pressure
• Discussing the exercises
1 / 11
Slide 1: Tekstslide

In deze les zitten 11 slides, met tekstslides.

## Onderdelen in deze les

This lesson
• Converting m2 to cm2
• Worksheet pressure
• Discussing the exercises

#### Slide 1 -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.

#### Slide 2 -Tekstslide

Converting m2 to cm2
Two questions
• How many centimeters (cm) are there in 1 meter (m)?

• How many squared centimeters (cm2) are there in 1 squared meter (m2)?

#### Slide 3 -Tekstslide

Worksheet pressure

#### Slide 4 -Tekstslide

Worksheet pressure – cheat sheet
Converting m2 to cm2
Converting N/m2 to N/cm2
Formula's
weight

Pressure

W=mg
P=AF
Symbols:
• W: weight — The force of gravity exerted on an object – Expressed in Newtons (N)
• m: The mass of something — Expressed in kilograms (kg)
• g: Gravitational field strength — The strength of a planets gravity – Expressed in (N/kg)

• P: Pressure — The amount of force applied per surface area — Expressed in N/m2 or N/cm2
• F: Force — The strength of a push or pull — Expressed in Newtons (N)
• A: The size of a surface area — Expressed in m2 or cm2

#### Slide 5 -Tekstslide

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

#### Slide 6 -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 7 -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
W=mg

#### Slide 8 -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 9 -Tekstslide

Homework
• Do the workbook exercises of 8.3

#### Slide 10 -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.