Poseidon's Magic (page 8) Archimedes and Poseidon's Magic

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Poseidon’s Magic
Poseidon was the Greek god of the sea and the rivers.
As the rivers flow over the land things like salt dissolve in them.  The salt is carried into the ocean. When the ocean water evaporates the salt is left behind.
Materials: cup, grape, water, salt, spoon
STEP ONE:  Fill cup with water, drop grape into cup

What happened?

STEP TWO: Add salt to the cup, stir

What happened?



What’s Up? Archimedes’ Principle says that if an object weighs more than its volume in water it will sink.  Adding salt to the water will increase the mass until the water is more dense than the grape, so it floats.                
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Amazing Water (page 7) Archimedes and Poseidon's Magic

Area between dotted lines ........ goes on page 7 of workbook

Amazing Water
Drops on a Penny
Materials: penny, eyedropper and water
STEP ONE: Place the penny on the table.
STEP TWO: Use the eyedropper to drop water onto the penny.
STEP THREE: Count the drops.

WHAT’S UP? Surface tension is an effect within the surface layer of a liquid that causes it to behave as an elastic sheet. The water molecules pull together so the drops don't fall.

More surface tension
Materials: bowl, cup of nonfat milk, food coloring, tsp detergent
STEP ONE: Pour milk into bowl
STEP TWO: Drop food coloring in center of bowl.
STEP THREE: Finally add detergent to outside of bowl.
WHAT’S UP? The detergent weakens the surface tension and draws the food coloring to the outside of the bowl.

Archimedes' Catapult (page 5 ) Archimedes' and Poseidon's Magic

Archimedes’ Catapult
King Hiero asked Archimedes to build war machines to defend Greece against the Romans.  Archimedes invented the catapult.
Materials: 9 popsicle sticks, 5 rubber bands, spoon
STEP ONE: Take 7 sticks and fasten together with a rubber band near one end.
STEP TWO: Add a rubber band to the opposite end
STEP THREE: Take two sticks, fasten together with a rubber band as close to the end as possible
STEP FOUR: Insert the stack of 7 sticks between the two sticks (see picture below)
STEP FIVE: Make an X with a rubber band to hold the 9 sticks together (see picture below)
STEP SIX: Use a rubber band to attach the spoon to the end of the top stick (see picture below)
Mini Marshmallow Catapult
What’s Up? The catapult throws objects into the air over great distances by releasing tension that is stored in the flexed piece of wood.                                                       5

Archimedes' Lever (page 4) Archimedes and Poseidon's Magic

Area between dotted lines ..... should be placed on page 4
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Archimedes’ Lever
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Archimedes said, “Give me a lever and a place to stand and I will move the earth.”

Materials: ruler, weight, small piece of doweling, bean

STEP ONE: Place the ruler (lever) on the doweling (fulcrum), balance it so one end is on the table, the other end in the air
STEP TWO:  Place the bean on the end of the ruler that is on the table
STEP THREE: Drop the weight (force)  on the end of the ruler that is in the air

What Happened?

STEP FOUR: Move the doweling (fulcrum) Repeat step three

What Happened?
What’s Up? A lever has two parts: the lever (ruler) and the fulcrum (doweling).  Placement of the fulcrum determines how far an object will move and how much force is needed.     
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USE WHAT YOU LEARNED (page 3) Archimedes and Poseidon's Magic

Area between dotted lines ......... goes on page 3 of workbook

Use What You Learned - Foil Boats

Materials: tub, water, 5 x 5 piece of tin foil, pennies


STEP ONE:  Fill tub with water
STEP TWO: Make a boat out of tin foil
STEP THREE: Place boat in the water
STEP FOUR: Add pennies, one at a time, until the boat sinks

How many pennies did your boat hold?

STEP FIVE: Take the pennies out of the water

Draw a picture of your boat







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GOLD CROWN PROBLEM (page 2) Archimedes and Poseidon's Magic

Area between dotted lines .......... goes on page 2 of workbook
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Archimedes’ Gold Crown Problem
Archimedes made one of his most famous discoveries by stepping into a bathtub.  When he displaced the water in the tub he realized that it was the solution to figure out if the king’s crown was pure gold.

Materials: 2 pieces of 3 X 3 foil, tub of water, 10 pennies
STEP ONE: Wrap a piece of foil around 5 pennies
STEP ONE:  Fold it into a ball, drop into water.
    What happened? __________________
STEP TWO: Use the second flat sheet.  Experiment with shaping the second piece until it holds 5 pennies and floats.

What’s Up? Both pieces of foil have the same mass. When the second piece of foil is shaped into a boat the mass is the same but the volume has increased. With a hollow hull on the tin foil boat the boat displaces more water than the ball.
The picture is of the “Oasis of the Sea” it is the world’s largest cruise ship and it has a mass of 100,000 tons.  Yet, it floats.  Using Archimedes principle, ship designers know that a boat must displace a volume of water that is more than its own weight.
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Title Page Archimedes and Poseidon's Magic



Area between dotted ines .......... goes on the cover of the workbook

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Archimedes’ Simple Machines and Poseidon’s Magic


    Archimedes’ Gold Crown Problem page 2
    Use What You Learned - Foil Boats page 3
    Archimedes’ Lever page 4
    Archimedes’ Catapult page 5
    A Simple Archimedes’ Pulley page 6
    Amazing Water page 7
Poseidon’s Magic page 8

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