A
true or false
steel is a synthetic material
true
true or false
all objects are only made from one material
False
some objects are made from more than one material.
fill in the missing word:
we choose materials for specific ____________ or functions based on their properties.
purposes
what is a scissor used for?
to cut
what is a helmet used for?
for safety, to protect your head if you in an accident.
name two products made from wood
paper
table
chairs
chopsticks
name two products made from cotton
clothes
towels
cotton buds
name two products made from leather
belt
bag
shoes
name two product made from ceramics
tile
jar
bowl
figurine
name two products made from plastic
plastic bag/straws
rules
toys
container
where does leather come from?
skins of animals
where does silk come from?
silkworms
where does wool come from?
sheep
what material do we get from the ground?
(not wood)
metal
where do we get rubber from?
rubber tree sap
what properties does a material that can stretch easily without breaking have?
Elasticity
what properties does a material that can support a heavy load have?
Strong/ strength
what properties does a material that keeps you dry from water have?
waterproof
what properties does a material that gets hot quickly have?
heat conductivity
what properties does a material that allows most light to pass through have?
transparency
materials that do not allow light to pass through them are called? eg: wooden board
opaque
Name 4 types of natural materials. EG: wood
Cotton
rubber
leather
metal
silk
wool
feathers
name 3 types of man-made materials. eg: steel
glass
plastic
ceramics
Name 4 properties that materials have?
absorbency
strength
hardness
flexibility
elasticity
heat conductivity
magnetic
transparency
how is glass made?
sand + fire = glass