You have some water in a glass. You notice that very small pieces of wood are floating on the water . How can you separate them from water
Answers
Answer:We have seen that our food and clothes
have so much variety in them. Not just
food and clothes, there is such a vast
variety of objects everywhere. We see
around us, a chair, a bullock cart, a
cycle, cooking utensils, books, clothes,
toys, water, stones and many other
objects. All these objects have different
shapes, colours and uses (Fig. 4.1).
Look around and identify objects
that are round in shape. Our list may
include a rubber ball, a football and a
glass marble. If we include objects that
are nearly round, our list could also
include objects like apples, oranges, and
an earthen pitcher (gharha). Suppose
we were looking for objects that are
edible. We might include all the items
that we have listed in Tables 1.1, 1.2
and 1.3 in Chapter 1. We might also
find that some of those round shaped
objects we just listed out, are also in
this group.
Let us say, we wish to make a group
of objects that are made of plastics.
Buckets, lunch boxes, toys, water
containers, pipes and many such
objects, may find a place in this group.
There are so many ways to group objects!
In the above examples we have grouped
objects on the basis of their shape or the
materials they are made from.
All objects around us are made of one
or more materials. These materials may
be glass, metal, plastics, wood, cotton,
paper, mud or soil. Can you think of
more examples of materials?
Activity 1
Let us collect as many objects as
possible, from around us. Each of us
could get some everyday objects from
home and we could also collect some
objects from the classroom or from
outside the school. What will we have
in our collection? Chalk, pencil,
notebook, rubber, duster, a hammer,
nail, soap, spoke of a wheel, bat,
2021–22
SORTING MATERIALS INTO GROUPS 27
Boojho wants to know, whether
we found some materials that
were used for making more than
one type of an object.
matchbox, salt, potato. We can also list
objects that we can think of, but, cannot
bring to the classroom. For example,
wall, trees, doors, tractor, road.
Separate all objects from this
collection that are made from paper or
wood. This way we have divided all objects
into two groups. One group has the
objects that are made from paper or wood
while the other group has the objects
that are not made of these materials.
Similarly, we could separate the things
that are used for preparing food.
Let us be a little more systematic. List
all objects collected, in Table 4.1. Try to
identify the materials that each one is
made of. It would be fun to make this a
large table – collecting information
about as many objects as possible. It
may seem difficult to find out the
materials out of which some of these
objects are made. In such cases, discuss
with your friends, teacher and parents
to identify the materials.
Table 4.1 Objects and the materials
they are made of
stcejbO
erayehtslairetaM
foedam
(etalP ilaht )
scitsalp,ssalg,leetS
)rehtoyna(
neP latem,scitsalP
Activity 2
Table 4.2 lists some common materials.
You can also add more materials in
Column 1 that are known to you. Now,
try and think of everyday objects you
know, that are made mainly of these
materials, and list them in Column 2.
Table 4.2 Different types of objects
that are made from the same
material
lairetaM
foedamstcejbO
slairetameseht
dooW
,elbat,riahC
trackcollub,hguolp
...,sleehwstidna
repaP
,skoobeton,skooB
,syot,repapswen
...,sradnelac
rehtaeL
scitsalP
nottoC
What do we find from these tables?
First, we grouped objects in many
different ways. We then found that
objects around us are ma
Explanation: