sorting material into groups

1. SORTING MATERIALS INTO
GROUPS
UNIT-4
BY:
MISS RITIMA
APS RAKHMUTHI

2. WHAT ARE THINGS MADE UP OF?
 When we look around, we find ourselves
surrounded by a number of objects.
 These different objects are made from a number
of different materials, while some are made using
the same material.
 For Example, both desk and chair are made from
wood while pen and dustbins are made using
plastic.
 The material from which an object is made
depends on its properties

3. OBJECT AND MATERIAL THEY ARE
MADE OF

4. PROPERTIES OF MATERIAL
There are two properties which are common to all
materials, these properties are:
 All materials occupy space.
 All materials have mass.

5. MATERIALS THAT YOU USE IN DAILY
LIFE

6. -
In previous slide you see different materials ,
depending upon properties and use, we segregate
them into different groups.
Grouping together of things having similar
properties is called classification.
Some of the properties of materials which help us to
classify are:
 Appearance
 Hardness
 Solubility - Soluble or insoluble
 Density – float or sink
Transparency

7. APPEARANCE
Materials look different from each other. Plastic
look different for paper, paper looks different from
wood , iron looks different from aluminium and so
on.
 some materials have lusture (shine) .
Examples - gold, copper, aluminium, iron etc.
 Materials on basis of lustre can usually be classified
as Metals and Nonmetals.
 Metal loses its lustre after some time due to the
action of moisture and air on it. Therefore only
freshly-cut metals appear to have lustre on them.

8. .

9. HARDNESS
Materials can also be classified on the basis of
hardness.
Materials that can be easily compressed or
scratched are called Soft.
Materials that cannot be scratched and are
difficult to compress are termed as Hard.

10. Solubility
Materials that can be
dissolved in water
upon stirring are said
to be soluble materials.
For Example:
Sugar and Salt can be dissolved in water.
Materials that cannot be dissolved in water (no
matter how much we stir them) are said to
be insoluble materials.
For Example, Stones and Clothes cannot be dissolved
in water.

11. DENSITY
Density is mass per unit volume of the
substance.
Substances having higher density will sink and
substances having lower density will float in
water.
For Example: leaves and corks float in water while
rocks and coins sink in water.

13. TRANSPARECY
 Objects or material through which we can see are
said to be transparent objects.
For Example, Glass, clear water .
 Objects and materials through which things can be
seen but only partially are called Translucent objects.
Butter paper and frosted glass are some examples of
translucent objects.
 Objects through which we can not see are known
as opaque objects.
For Example, Metals, wood and cardboard are some
examples of opaque materials as you cannot see
through them.