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Lesson 5
Pressure in liquids
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Slide 1:
Slide
Nask
Middelbare school
havo, vwo
Leerjaar 2
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Items in this lesson
Pressure in liquids
Slide 1 - Slide
This lesson
Recap + exercise
Fluid pressure
Working on exercises
Slide 2 - Slide
Learning goals
Name the formulas for pressure and weight and be able to apply them.
Explain what is meant by liquid pressure.
Explain why there is greater pressure at the bottom of the sea than at the surface.
Slide 3 - Slide
Recap
Slide 4 - Slide
P3 — Pressure & density
Pressure is the result of force being applied to a surface.
Force is measured in newtons (N)
area is measured in square meters (m
2
)
The formula for pressure is:
The unit of pressure is pascal (Pa). One pascal is 1 N/m
2
P
r
e
s
s
u
r
e
=
a
r
e
a
f
o
r
c
e
Slide 5 - Slide
P3 — Pressure & density
Weight:
With how much force an object is pulled down
W
e
i
g
h
t
=
m
a
s
s
⋅
g
r
a
v
i
t
a
t
i
o
n
a
l
f
i
e
l
d
s
t
r
e
n
g
t
h
W
=
m
⋅
g
Slide 6 - Slide
Pressure
ρ
=
A
F
p
r
e
s
s
u
r
e
=
A
r
e
a
F
o
r
c
e
Pressure (ρ): Pascal (Pa – N/m
2
), N/cm
2
Force (V): N
Area (m): m
2
, cm
2
Slide 7 - Slide
Pressure
w
=
m
⋅
g
W
e
i
g
h
t
=
m
a
s
s
⋅
g
r
a
v
i
t
a
t
i
o
n
a
l
f
i
e
l
d
s
t
r
e
n
g
t
h
Weight (W): Newton (N)
Mass (m): kilogram (kg)
Gravitational field strength (g): N/kg
Slide 8 - Slide
Exercise
Two scenario's:
1) A man is standing on 7,60 cm thick ice. He has a mass of 88 kg and one of his feet has an area of 0.0047 m
2
2) A man is laying flat on his back on 7,60 cm thick ice. He has a mass of 88 kg. His body touching the ice has an area of 0.0915 m
2
Ice of this thickness breaks at about 18.000 Pascal (N/m2).
The gravitational field strength on Earth is 9.8 N/kg
a) Calculate the pressure for each scenario.
b) Explain wether the ice will break or not.
Slide 9 - Slide
Liquid pressure
Slide 10 - Slide
Slide 11 - Slide
Upthrust
What is upthrust?
Slide 12 - Slide
Upthrust
Slide 13 - Slide
Liquid pressure
And upthrust
Slide 14 - Slide
To-do for the coming week
Read:
8.3
8.4
Do:
8.3 yellow block + workbook exercises
8.3 yellow block + workbook exercises
Due for the seconds lesson of next week
Slide 15 - Slide
Learning goals
Name the formulas for pressure and weight and be able to apply them.
Explain what is meant by liquid pressure.
Explain why there is greater pressure at the bottom of the sea than at the surface.
Slide 16 - Slide
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