3.4 Applying des Principle
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Topic:
Applying Archimedes Principle
By:
Sir Solehin
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Previous Lesson1. Pressure
What is Pressure??
� Pressure is defined as force per unitarea
� P = F
A
2. Pressure in liquids� P = hg
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Try This!!!
Push the balloon into the water.
What do you feel???
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Today·s Activities:
1. Class activity ² to investigatethe relationship between the
buoyant force and weight of fluid displaced.
2. Group discussion onArchimedes Principle·sapplication.
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What is Buoyant
Force??
An upward force resulting from an
object being wholly or partially
immersed in a fluid.
Buoyant Force is«.
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What is the relationship between
the buoyant force and the weight
of fluid displaced??
Buoyant force
Liquid
displaced
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ACTIVITY 1 !!!
To investigate the relationship
between the buoyant force and
the weight of fluid displaced
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ARCHIMEDES
PRINCIPLE«State that,
when an object is wholly or
partially immersed in a fluid, it
experiences a buoyant force
equal to the weight of fluid
displaced.
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Group 1, 3 & 5
Group 2, 4 & 6
In group, find..
- The working principle- How Archimedes Principle
was applied?
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Submarine
� Has special compartments ± ballast tanks.� In diving ± ballast tanks are flooded with sea water to
increase the overall weight (higher than the buoyantforce)
� When water is forced out of its ballast tanks, the
submarine rises.
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Learning Outcomes«
1. Explain Buoyant Force
2. Relate buoyant force to the weight of the
liquid displaced
3. State Archimedes Principle
The upward force resulting from an object being
wholly or partially immersed in a fluid.
BUOYANT FORCE = WEIGHT OF THE LIQUID DISPLACED
(for an object which immersed wholly or partially in fluid)
State that when object is wholly or partially immersed in a fluid,
it experiences a buoyant force equal to the weight of the fluid
displaced.
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Pressure
P = F
A
Si Unit:
Pascal (Pa)
Pressure in liquids,
P = hg
Gas
pressure
Atmospheric
pressure
Archimedes¶
Principle
Bernoulli¶s
Principle
Buoyant force
Pascal¶sPrinciple
Hydraulic
system
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Homework!!
1. Page 100 in text book
Question 1 and 2
2. Read page 100 ² 101 in text
book
(Bernoulli·s Principle)
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That·s all for today
Thank you for your attention!!