6. Are these true or false? Correct the false ones.
Example: a) – TRUE. The bin on the left is made of metal and the one on the right is made of plastic. Use the plastic one.
b) The ruler at the top is made of wood and the one at the bottom is made of steel. Use the wooden one.
c) The bottle on the left is made of glass and the one on the right is made of plastic. Use the glass one.
d) The pipe at the top is made of copper and the one at the bottom is made of plastic. Use the plastic one.
e) The goggles on the left are made of plastic and the ones on the right are made of glass. Use the plastic ones.
f) The plug on the left is made of plastic and the one on the right is made of rubber. Use the plastic one.
7. Make sentences:
EXAMPLE:
a) The teeth of this wheel are made of steel.
d) The handle of this hammer is made of wood and the head is made of steel.
a) WHEEL
teeth – steel
b) CHAIR
arms – metal
c) LADDER
rungs – steel
d) HAMMER
handle – wood
head – steel
e) KNIFE
handle – plastic
blade – steel
f) CHISEL
handle – wood
blade – steel
8. Read these sentences and make tables like the ones above.
EXAMPLE:
a) TANK
sides – steel
cover – plastic
a) The sides of this tank are made of steel and the cover is made of plastic.
b) The walls of this house are made of brick and plaster and the roof is made of concrete.
c) The blades of this fan are made of plastic and the guard is made of steel.
d) The sides of this box are made of wood and the lid is made of steel.
e) The blades of this knife are made of steel and the handle is made of plastic.
9. Copy the diagram into your table and compete the labels:
This tank has two pipes and a cover. The tank is made of plastic. The cover is made of wood. The pipe at the top is made of plastic. The pipe at the bottom is made of copper.
Copy this diagram into your notebook. Complete the labels. Make a description:
11. What are these material called?
oil / paper / water / paint / sand / cement / concrete / gravel/ stone / petrol
12. What are these called?
tin / sack / tile / bucket / brick
13. Study this:
14. Make phrases:
EXAMPLE: a) A bucket of gravel or a sack of gravel or 10 kilos of gravel
a) gravel
b) wood
c) sand
d) steel
e) paint
f) glass
g) paper
h) cement
i) oil
j) water
Use these words: sheet / sack / pane / bucket / tin / plank / kilo / litre
1
5.
Which materials:
1. are metals?
2. come from trees?
3. come from animals?
4. are synthetic (man-made, not natural)?
16. Brainstorm things that can be made of these materials.
Steel
Leather
Rubber
Fiberglass
Nylon
Gold
Wool
Ceramic
Wood
Plastic
Polystyrene
Glass
Wax
Paper
Polythene
Foam rubber
Cotton
Aluminium
17. Complete the table.
2. Properties of Materials
1. Study this:
2. Make at least three materials for each sentence:
EXAMPLE: a) Paper, wood and oil.
a) You can burn it.
b) It is brittle.
c
)
You cannot scratch it easily.
d) It is very tough.
e) It is non-combustible.
f) You can bend it easily.
g) It is very hard.
h) It is rigid.
3. Answer these questions and give the reasons:
E
XAMPLE:
a)
No, you can’t. Glass is a hard material.
d) Yes, you can. Rubber is a flexible material.
a) Can you scratch a pane of glass easily?
b) Can you break steel easily?
c) Can you bend a plank of wood easily?
d) Can you bend a rubber tyre easily?
e) Can you burn a stone block easily?
f) Can you break a pane of glass easily?
g
)
Can you bend a concrete beam easily?
h) Can you scratch a plank of wood with a knife easily?
i) Can you burn a sheet of paper easily?
j) Can you bend iron easily?
4. Complete the sentences using the words from the list.
5. Copy this table into your copy-book and compete it:
6. Make questions and answers from the table:
EXAMPLE: a) A: Why are bridges made of steel?
Because steel is a tough material. You can’t break it easily.
7. Answer these questions:
EXAMPLE: a) Because rubber is a flexible material. You can bend it easily.
a) Why are bridges not made of rubber?
b) Why are goggles not made of glass?
c) Why are tyres not made of iron?
d) Why are vices not made of plastic?
e) Why are buildings not made of paper?
f) Why are files not made of rubber?
g) Why are helmets not made of glass?
h) Why are matches not made of stone?