changes to the properties
TRANSCRIPT
Changes to the properties
of an object
Changes to properties of an object
Learning goal:
How can properties CHANGE?
How can properties CHANGE?
At home in the morning making your lunch …..
Lunch time …..
How can properties CHANGE?
How can properties CHANGE?
How can properties CHANGE?
Changing Properties
Widgit Symbols (c) Widgit Software 2002-2012 www.widgit.com; Queensland Supplier: www.spectronicsinoz.com
Melting Boiling
Baking Frying
Freezing
Why change a property?
Widgit Symbols (c) Widgit Software 2002-2012 www.widgit.com; Queensland Supplier: www.spectronicsinoz.com
Why change a property?
Widgit Symbols (c) Widgit Software 2002-2012 www.widgit.com; Queensland Supplier: www.spectronicsinoz.com
Physical changevs
Chemical change
Widgit Symbols (c) Widgit Software 2002-2012 www.widgit.com; Queensland Supplier: www.spectronicsinoz.com
Physical change
A physical change is a change in how matter looks,
but not the kind of matter it is.
• Tear
• Folded • Mixture
• Solution
Physical change:Examples of physical changes that happen in everyday life include: • sugar dissolving in coffee • water boiling or freezing• chopping vegetables• breaking a glass• carving wood• making a paper plane!
Can you think of some more?
Physical changes - made for a
purpose
The papers have been folded and rolled to fit into the letterbox.
Images © DETE
The paper has been folded to fit into the envelope.
The paper map is folded to keep it safe and undamaged.
Images © DETE
How has the metal been changed?
Sharpened to make a knife for cutting food.
Moulded to hold water or food for the dog.
Bent to hook into ears, and curled to hold the beads on these earrings.
Shaped to make a ring for wearing on a finger.
Images © DETE
These vegetables have been cut to make a salad. The sugar has been dissolved
into a bowl of water.
The oil and vinegar have been mixed to make a dressing
Images © DETE
The fabric has been sewn to make a curtain, and threaded onto the curtain rod to hang.
The string has been wound or rolled into a ball to prevent it from tangling.
The plastic has been broken to open the bottle.
Images © DETE
Physical changes – made to increase strength…
Image © DETE
The paper has been woven and sewn to make the hat strong.
The straw has been woven and sewn to make the hat strong.
Images © DETE
Image © DETE
Image © DETE
Let’s explore some ways Aboriginal and Torres Strait Islander Peoples have
physically changed materials in the past…
This wood has been carved and hollowed out by Aboriginal peoples to make a dish to carry things.
Images courtesy of Joseph Sambono. Used with permission.
These tools have been made from wood by Aboriginal peoples. The wood is shaped, polished and carved.
Image courtesy of Joseph Sambono. Used with permission.
These didgeridoos have been made by termites hollowing out the wood. Aboriginal peoples decorate and polish the wood.
Images courtesy of Joseph Sambono. Used with permission.
These stones have been split, sharpened, ground or carved to make tools.
Images courtesy of Joseph Sambono. Used with permission.
A piece of bamboo has been cut and bent to make tongs, for moving hot stones and hot food, by Torres Strait Islander peoples.
Images courtesy of Joseph Sambono. Used with permission.
Palm leaves are torn to make strips, then woven to make things such as baskets, mats and fans.
Example from Torres Strait Islands.
Images courtesy of Joseph Sambono. Used with permission
Indigenous Australians make paintbrushes by shredding the ends of sticks or cutting pieces of reed.
Images courtesy of Joseph Sambono. Used with permission.
Indigenous Australians weave, stitch and tie pandanus palm leaves to make bags, baskets and mats.
matbag
Images courtesy of Joseph Sambono. Used with permission.
basket
Coconut shells have been cut, carved, shaped and polished to make beads and decorations for these Fijian necklaces. A stone has also been carved for decoration.
Images courtesy of Helen Brown. Used with permission.
Grasses have been dried and tied to cover this shelter in Fiji.
Tiny holes have been drilled in shells and they have been threaded together to make this necklace.
Images courtesy of Helen Brown. Used with permission.
Palm leaves have been cut, woven, plaited and tied to make these Fijian baskets.
© Helen Brown
.
Wood has been cut, chopped, chipped, carved, chiselled and sanded to make this turtle in Fiji.
Grasses have been plaited, twisted and tied by Indigenous Australian peoples to make these ropes stronger.
Palm leaves have been plaited and woven by Torres Strait Islander peoples to make this basket stronger.
This basket has been made by Indigenous Australians. The bark of a tree has been folded, pleated and tied to make it strong.
Resin has been added to make it both water resistant and stronger.
Plant materials such as palms and grasses have been plaited and twisted by Indigenous Australians to make rope,
and then tied to make nets.
Images courtesy of Joseph Sambono. Used with permission.
The clay was shaped, smoothed and hardened to create the jug and the vase.
Images © DETE