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CONSERVATION OF NUMBER, MASS, and
WEIGHT :
The child is nine years old.
While doing the observation none of his parents was standing
near to us.
CONSERVATION OF MASS:
I brought with me two equal balls of clay (pate a modeler). I
gave them to the child who immediately started by rolling them,
trying to get a perfect sphere, then I asked him the first
question which is:
Is there the same amount of clay in each of these balls?
The answer was that they are the same.
Proceeding to the second step which is squashing one of the two
balls into a pancake, then asking the child:
Is there the same amount of clay in the in the pancake or in the
sphere one?
His answer was that the pancake and the ball (the sphere) are
the same, because we didn't add any clay to both of them.
CONSERVATION OF NUMBER:
I brought with me identical pieces of Lego and I placed them in
two rows that are equal in number and parallel to each other as
follow:
* * * * *
* * * * *
Then I asked the child:
Is there the same number of pieces in the two rows?
His answer was that there is the same number in the two rows.
Proceeding to the second step which is to separate one of the
two rows as follow:
* * * * *
* * * * *
Then I asked the child:
Is there the same number of pieces in these two rows?
After counting each row the child said that they are the same.
Proceeding to the third step which is spreading the child's row
and adding two pieces to each row as it appears here:
* * * * * * *
* * * * * * *
Now asking again the second question which is:
Is there the same number of pieces in the two new rows? And why?
The answer was that they are the same, because I added the same
number of pieces on the two rows.
Finally I moved one row closer to each other and asked the
preceding question:
* * * * * * *
* * * * * * *
The answer of the child was based on counting the number of
pieces in each row then telling me that there is the same number
in the two rows.
CONSERVATION OF WEIGHT:
Going back to the two balls of clay, giving them to the child
and asked him:
Do these two balls weigh the same?
The child has agreed that the two balls weigh the same.
I took one of the balls and roll it into a hot dog shape, and
then I put the rolled one and the sphere one next to each other
and asked the child:
Do the hot dog one and the sphere one weigh the same? And why?
After some time thinking the boy realized that nothing was added
or removed from both the hot dog and the ball, and answered that
both weigh the same.
Finally since the child is nine years old and he is pretty
knowledgeable about lot of things in science the child has
conserved in the three experiments above.
I think that the child is mainly affected by the opinion of his
parents especially his mother.
The child was interested and was trying to show that he is
brilliant by his answers.
The order does affect the answers and performance of the child,
for example if the conservation of weight is placed at the
beginning the child will be distracted and lost. In my opinion
the given order is crucially important for full children
grasping.
Development of object
concept :
The baby is seven months old (brother of the first one)
When I did the observation his mother was present.
- First step: placing the baby in a sitting position on his
stomach then I put one of his favorites toy in front of him.
First of all the baby looked at it,
Secondly he tried to catch it but he couldn't reach it.
Finally he got it by crawling to it and starts examining it in his
mouth.
- Second step: the child was looking at me and at the toy after
that I covered it partially with a handkerchief.
First of all he took them both.
Secondly he removed the handkerchief.
Finally places the toy in his mouth.
- Third step: after removing the old toy and replacing it by a
new one (because the child was bored of the first one), I covered
it completely with the handkerchief.
As in the second step the baby went to the toy and examined it by
placing it in his mouth.
- Fourth step: in full view of the child I covered the toy with
a cloth .the baby looked at me while covering it without trying to
reaching it.
I think that the last step wasn't conformed because the baby is
only seven months which is 28 weeks old.
Using Tires In Asphalt
Pavement:
-
Tires take at least 800 years to decompose
-
3 billion tires in scrap piles in US alone with
250 million old tires added each year
-
Burning tires => Toxic chemical clouds + Oil spill
=> Part of our food
-
Tires piles attract rodents, mosquitoes and other
pests, and are a fire hazard
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