This lesson contains 20 slides, with text slides and 4 videos.
Items in this lesson
Slide 1 - Video
Slide 2 - Video
Slide 3 - Video
Slide 4 - Slide
Slide 5 - Video
Examples of pressure on daily life
Slide 6 - Slide
Slide 7 - Slide
Slide 8 - Slide
What is pressure?
Pressure is defined as the physical force exerted on an object over a certain area.
Slide 9 - Slide
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 - Slide
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 - Slide
Rearranging the formula
P= F/A 3=6/2
F=p×A
A=F/p
Slide 12 - Slide
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 - Slide
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 - Slide
Answer
Given: F=150 N
A=0,50 m^2
Asked: P=?
F: P=F/A
150÷0.5=300 N/m^2 or Pascals
Slide 15 - Slide
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 - Slide
Answer
G: P=300 pascals
A=0.02 m^2
A: F= ?
F: F=P.A
C: P=300×0.02=6 N
Slide 17 - Slide
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.
