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              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
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