# 8.1 and 8.2 Pressure and its applications

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Slide 1: Video
ScienceMiddelbare schoolvwoLeerjaar 2

In deze les zitten 20 slides, met tekstslides en 4 videos.

## Onderdelen in deze les

#### Slide 5 -Video

Examples of pressure on daily life

#### Slide 8 -Tekstslide

What is pressure?
Pressure is defined as the physical force exerted on an object over a certain area.

#### Slide 9 -Tekstslide

Formula of pressure
pressure= force/area​
p = F/A
p is the pressure
F is the force
A is the area
Pascal is defined as a force of 1N that is exerted on a unit area.
1 Pascal = 1 N/m2

Tekst

#### Slide 10 -Tekstslide

units of Pressure
Force is measured in Newtons (N).
Area can be cm² or m² and so pressure is measured in N/cm² or N/m² (Pascals).

#### Slide 11 -Tekstslide

Rearranging the formula
P= F/A   3=6/2
F=p×A
A=F/p

#### Slide 12 -Tekstslide

Difference between pressure and force

A force can be a push or a pull. When a force is exerted on an object it can change the object's speed, direction of movement or shape. Force Is applied to faces, vertices and edges.
Pressure is a measure of how much force is acting upon an area. Pressure is applied to faces.

#### Slide 13 -Tekstslide

Assignment
A force of 150 N is being applied over an area measuring
0.5 m^2.  Calculate the pressure on the object ensuring you give the correct units.

#### Slide 14 -Tekstslide

Given: F=150 N
A=0,50 m^2
F: P=F/A
150÷0.5=300 N/m^2 or Pascals

#### Slide 15 -Tekstslide

Assignment
A woman is applying 300  Pascals
of pressure onto a door with her hand. Her hand has area 0.02 m^2.  Work out the force being applied

#### Slide 16 -Tekstslide

G:      P=300 pascals
A=0.02 m^2
A:             F= ?
F:           F=P.A
C:      P=300×0.02=6 N

#### Slide 17 -Tekstslide

Assignment
Pressure of 150 Pascals is experienced when a force of 20 kN is applied. Calculate the area over which the force is applied to obtain the pressure stated.