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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!!