MacroteachingTopic: Applying Archimedes PrincipleBy: Siti Rahayu Binti Muaai L20091002823

Previous Lesson1. Pressure What is Pressure?? Pressure is defined as force per unit area P= F A P = hg

2.

Pressure in liquids

Try This!!!Push the ball into the water. What do you feel???

Learning Outcomes:At the end of this lesson, you should be able to: Explain Buoyant Force Relate buoyant force to the weight of the fluid displaced State Archimedes Principle

Todays Activities:1. Class activity to investigate the relationship between the buoyant force and weight of fluid displaced. 3. Group discussion on Archimedes Principles application.

What is Buoyant Force??Buoyant Force is.

An upward force resulting from an object being wholly or partially immersed in a fluid.

What is the relationship between the buoyant force and the weight of fluid displaced??

Liquid displaced

Buoyant force

ACTIVITY 1 !!!To investigate the relationship between the buoyant force and the weight of fluid displaced

From ACTIVITY 1..

ARCHIMEDES PRINCIPLE

ARCHIMEDES PRINCIPLEState that, when an object is wholly or partially immersed in a fluid, it experiences a buoyant force equal to the weight of fluid displaced.

ACTIVITY 2 !!!Applications of Archimedes Principle

Group 1, 3 & 5

In group, find.. - The working principle - How Archimedes Principle was applied?

Group 2, 4 & 6

Hot Balloon The hot air in the balloon displaces the surrounding air, which is denser resulting in a bigger up thrust that causes the balloon to rise.

Submarine Has special compartments ballast tanks. In diving ballast tanks are flooded with sea water to increase the overall weight (higher than the buoyant force) When water is forced out of its ballast tanks, the submarine rises.

Learning Outcomes1. Explain Buoyant ForceThe upward force resulting from an object being wholly or partially immersed in a fluid.

4.

Relate buoyant force to the weight of the liquid displacedBUOYANT FORCE = WEIGHT OF THE LIQUID DISPLACED (for an object which immersed wholly or partially in fluid)

7.

State Archimedes PrincipleState that when object is wholly or partially immersed in a fluid, it experiences a buoyant force equal to the weight of the fluid displaced.

PressureP=F A Pressure in liquids, P = hg Si Unit: Pascal (Pa) Gas pressure Atmospheric pressure

Pascals Principle

Archimedes Principle

Bernoullis Principle

Hydraulic system

Buoyant force

Homework!!1. Page 100 in text book Question 1 and 2 4. Read page 100 101 in text book (Bernoullis Principle)

Thats all for todayThank you for your attention!!