Page 31 - Science and Technology Std 3

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Activity 6 To produce heat energy

Materials A piece of stick and a piece of wood
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Procedure

(i) Rub your palms together.

(ii) Write what you felt when you were rubbing your palms.

(iii) Get a small dry piece of stick.

(iv) Twirl that small piece of stick to the big piece of dry wood.

(v) Touch the rubbed area of the dry wood.
(vi) What do you feel?

When you rub your palms, they become hot. Therefore, friction

causes heat.

Activity 7 To investigate objects which allow heat to pass

through

Materials Hot water, aluminium cup, plastic cup and large

wooden spoon

Procedure
(i) Fill hot water into the aluminium cup, plastic cup and
large wooden spoon.

(ii) Touch each of the materials.
(iii) Have you noted the difference of heat among them?

The transfer of heat differs from one object to another. Some
solid objects like aluminium and iron allow heat to pass very

fast. Objects like these are called good conductors of heat.
Solid objects like wood and plastic do not allow heat to pass
easily due to their nature. These objects are called insulators
or poor conductors of heat.

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PROPERTY OF UNITED REPUBLIC OF TANZANIA GOVERNMENT
Ministry of Education, Science and Technology
Science and Technology 3.indd 24 03/08/2019 11:01