Natural & Processed

choppedspleenMechanics

Feb 22, 2014 (3 years and 10 months ago)

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Natural & Processed
Materials.

Term 3, 2008

Observable properties


Secret bags and boxes.


Identify items by touch.


Natural and Man
-
made


Tennis ball, eggs, sweet and other potatoes, rocks.


Look at property of each and group accordingly
-



Shape


Size
-

microscopic


Texture
-

cotton wool & concrete


Density
-

heavy stone, light polystyrene ball


Temperature
-

feathers, wool, stones & concrete (in fire, sun, cold
water), ice


Use
-

glass, wood, metal & plastic


Look at composite items, like a car and list all the materials and their
uses


Personal preference. Why?


Test strength, hardness, stretchability.

STRENGTH

Spider silk

Fishing line

Rope

Pandanus

Elasticity

Take a 10 cm piece, and stretch it and measure again.

Elastic

Rubberised
cord

Wool

Fishing line


Size

How could you measure the size safely.

The Northern
Territory

Truck

Spider’s leg

Scabies mite


HARDNESS

0 very soft


10 very hard

Use a stick and rub for 1 minute.

Polystyrene
block

Sedimentary
rock

Igneous rock

Cement

Properties

Temperature

Mass


Texture

Use

Cold Hot

Light Heavy

Rough Smooth

Stone

Concrete

Ice

Feather

Wood

CHANGE OF STATE


Solid, liquid and gas

Solid

Liquid

Gas

Particles

Shape

Property

Rigid

Pour

Interesting mixtures.

Clay in water

Fizzy drinks

Cornflour and water

Volcanic rock

PHYSICAL STATE


2 kids cling together.


Wet a kid.


Melt ice.


Boil water.


Change shape and colour of


Playdough


Wire


Sponge


Elastic


Heat up Milo to drink.


Put bubbles in water to play.

CHEMICAL CHANGE


Cooked eggs


Burnt wood


Burn Mg ribbon


Cycad nuts

Chemical Reactions & Mixtures
(solutions, suspensions & sediments)

Water and sand

Water and cordial

Water and salt

Water and chalk dust

Water and pancake mix

Water and clay

Sand and iron filings

Drama


Separating people into groups


Moiety


Dhuwa & Yirritja


Gender


Using drama to show separation using colours.


Filter


Magnet


Sedimentation


Evaporation


Every day examples of these:


Filter: sports bag, kitchen colanders and sieves, teabags, and coffee
filters Lawn mower and car filters


Magnet: generator, electro
-
magnet


Sedimentation: sand settles to the bottom of puddles, use for car


Evaporation: dry clothes



Separating mixtures


Filter



Magnet



Evaporation



Sedimentation and decanting



Assessment
-
seperating mixtures.


Provided with a mixture of:


Coarse sand


Iron filings


Salt crystals