All thanks to Ashurii-sensei ☺. This PowerPoint is an introduction to pressure in solids and fluids. Just the basics (Your welcome).

1. PRESSURE Objectives
:

2. PRESSURE
Pressure is the force
per unit area over
which the force is
applied.

3. Pressure
formula
• The pressure formula allows
you to calculate the pressure,
force or area given two of the
factors.
• Pressure is measured in Pascals (Pa).
1 Pascal = 1 N/m2
• Force is measured in Newtons (N).
• Area is measured in metres squared
(m2).
EXAMPLE
A force of 10N acts over an
area of 2 m2. What pressure is
created by the force?
Pressure = Force ÷ Area
Pressure = 10 N ÷ 2 m2
Pressure = 5 N m2 ---> 5 Pa

4. EXAMPLE 2
A) If a block weighs 60 N and is lying on a side with area 2m by 3m, what
is the pressure exerted on the surface?
Pressure = Force ÷ Area
P = 60 N ÷ (2m x 3m)
P = 60 N ÷ (6m2)
P = 10 Pascals
B) If the same 60 N block is now lying on its end which is 2m x 0.5m, what
is the pressure?
Pressure = Force ÷ Area
P = 60 N ÷ (2m x 0.5m)
P = 60 N ÷ (1m2)
P = 60 Pascals

5. Pressure:
Question 1

6. Pressure in Fluids
• Fluid pressure is a measurement
of the force per unit area on a
object in the fluid or on the surface
of a closed container.
• Since a fluid has no definite shape,
its pressure applies in all
directions.

7. Pressure in Fluids
• The deeper the object is placed in the
fluid, the more pressure it experiences.
• This is because is the weight of the fluid
above it.
• The more dense the fluid above it, the
more pressure is exerted on the object
that is submerged, due to the weight of
the fluid.
• The formula that gives the P pressure on
an object submerged in a fluid is
P = ρ × g × h
• ρ is the density of the fluid
• g is the acceleration of gravity
• h is the height of the object at that point in the flu

8. Density of a Fluid
• The density, (often represented by the
symbol ρ)
• is defined as the mass over the
volume.
• The unit for density is kg/m3

9. RECAP Assignment
• Do some research on
Archimedes' Principle.
This must include:
• (i) Definition of Archimedes'
Principle must be easy to
read and understand. (2
marks)
• (ii) Give an example of the
Archimedes' Principle in
effect. (3 marks)
• Here are some good
websites:
• Khan Academy
• Hyperphysics
• The Physics Classroom

10. Pressure