Materials, Properties and Uses (Lesson 3)

 FOCUS QUESTION

What are some properties of common materials and their everyday uses?

SPECIFIC OBJS.

 1.  Examine a selection of materials/objects to determine the transparency, absorbency, strength, magnetic property and heat conductivity of materials in everyday use.

2. Work cooperatively in groups

CONTENT SUMMARY

Materials exist as solids, liquid or gases. Materials/objects have different properties, such as transparency absorbency, strength, magnetic property, and heat conductivity, which determine their everyday use.

Improper disposal of some materials can affect the environment.

Materials can undergo reversible or irreversible changes. Irreversible changes cannot be undone and form new materials. Reversible changes can be undone. Reversible and irreversible changes can be useful in everyday life.

Substances can change their state by heating and cooling.  Melting, freezing, evaporation and condensation can cause materials to change state.

ENGAGE

Students will review past lesson on hazardous materials and why they have to be so stored in their various containers. Tell if all the materials are the same then.

EXPLORE

Students will watch a youtube video clips on materials to glean information on the different types of materials and their properties.

Video: Materials 1

Video: Properties of materials

Teacher will highlight terms like transparency, absorbency, strength, magnetic property and heat conductivity and have students providing their meanings based on video clips.

In groups students will be given sets of identical materials to investigate an assigned property:  transparency, absorbency, strength, magnetic property, and heat conductivity. They will record observation in a table.(Each group will examine one property) Eg.

MATERIALS	PROPERTY :  ( E.g.. Absorbency)
	Weak	Fair	Strong
Plastic slippers
Paper
Plastic
Spoon
Piece of glass
Plastic ruler
A T-Shirt

EXPLAIN

Students will discuss their findings in the different groups, explaining how they carried out the investigation.

EXTEND/ELABORATE

In groups, students will create a worksheet on Properties and uses of Materials. They will use materials found in their home/school and complete a table showing name of material, what it is used for/made from, why the material is a good choice and the property of the material (eg. Transparent, absorbent, conductor etc.)

Material	Made From	Property of material	Justification for its use
Enamel pot
Plastic garbage bin
Clothes iron
Spoon
Windscreen

 Video clip: Properties of materials 2

EVALUATE 

1.       Which item below represents a  good conductor of heat?

(a)    Steel     (b) paper     (c) plastic     (d)  rubber

Give reasons to support your answer. ____________________________________________

.   J June will be going a field trip in the summer to Dunn’s River Falls. She was told that it is forbidden to climb the falls without a foot wear. She is undecided as to type foot wear to buy. Which property of materials should she take into considerations when choosing her footwear? Is it ABSORBENCY or TRANSPARENCY?

Justify your answer. ______________________________________________________________

3.       Use the words on the left to match the corresponding statements they refer to on the right.

 

COLUMN 1	COLUMN 2
Transparency	Some materials are waterproof and other materials let water through. This speaks of _______ of material.
Absorbency	Some materials are flexible and others are rigid.
Strength	Some materials let heat travel along them. They are good ____.
Heat conductivity	Some materials are see-through
Malleability	Some materials are strong while some are weak

4. Read through the statements below ((a -j). Match each property word below to the statement that best describes or explains it then complete the table with an example of an object that you know of, or have used, which has this property.

     

                                                  PROPERTIES OF MATERIALS

absorbent  conductive  elastic   flexible  magnetic  metallic strong  translucent   transparent  waterproof

Statement	Property word	Example of object
a) Is shiny, strong, malleable, a conductor
b) Is attracted to magnets
c)Takes in or soaks up liquids easily
d) Allows some light to pass through
e)Allows heat and electricity to pass through
f) Thing you see through clearly
g) Bends easily without breaking
h)Repels or resist water so it does not get wet
i) Can be stretch and returned to original length j) Will not break easily

5. Granny B went into the kitchen when she saw her granddaughter just about to stir a boiling hot soup with a spoon. Read what Granny B said as she handed Suzette a different spoon.

Use the cartoon to answer the questions below.

(a) Based on Granny B's comment, what type of material do you think Suzette's spoon was made of?

(b) Why would her grandmother give her that warning about that spoon?

(c) What material do you think Granny B's spoon was made of?

(d) Explain how Granny B's spoon might behave differently in the hot soup than Suzette's spoon.

6. Shade the letter beside the correct responses.

The frying pan has two different materials because _____________.

a) the metal part and wooden handle look nice together.

b) the handle can protect your hand from heat

c) the metal part will insulate food when the pan is on the fire

d) wood does not conduct heat easily.