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DO NOT DUPLICATE
You can carry loads using a wheelbarrow or hands. Carrying
loads using a wheelbarrow is simple and less tiresome. You
can also carry bigger loads much easier using a wheelbarrow
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than using hands.
Using tools that simplify work
Look at the following pictures and then read the description
that follows.
(a) (b)
Figure 5 Moving a stone
The first picture in Figure 5 shows a pupil pushing a stone
with hands. The second one shows a pupil moving a stone
using a crowbar.
Question
Which one is the simpler way of moving the stone?
Activity 1 Moving a log
Materials A crowbar, a log and a small stone
Procedure
(i) Try to push a big log using hands.
(ii) Put a small stone near the log.
(iii) Put the crowbar on top of a small stone and one of its
edges below the log.
(iv) Push down the crowbar and see whether you can move
the log.
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PROPERTY OF UNITED REPUBLIC OF TANZANIA GOVERNMENT
Ministry of Education, Science and Technology
Science and Technology 3.indd 54 03/08/2019 11:02