Background knowledge


1 Cut the A4 paper lengthways into 70 mm wide strips. 2 Fold about 20 mm of each strip over a straw and secure this with staples. 3 Attach a bulldog clip to each end. 4 Hang the top clip from a nail fixed into a vertical post. 5 Hang the weight from the bottom clip. This arrangement should be able to carry the weight without tearing the paper.


6 Cut a strip from each side of the paper as indicated by the first broken line in the sketch in the Learner’s Book.


7 Test to see if it still supports the weight. 8 Keep cutting sections away from each side to see how thin the strip in the middle can be before the paper tears.


Assessment guidelines


• This activity is intended for informal assessment. • Observe the groups as they are busy with the activity.


Activity 5 Examine electricity pylons Learner’s Book page 18 Guidelines to implement this activity


This is a group activity. • Divide the learners into groups of 3–4. • Explain the three photographs on page 17 of the Learner’s Book.


Background knowledge


• Picture A – shows a tower with horizontal cross-bracing and triangulation to strengthen the structure.


• Picture B – shows another tower with horizontal cross-bracing and triangulation. • Picture C – show a tower where the whole structure will be in compression.


Assessment guidelines


• This activity is intended for informal assessment. • Use the checklist below to assess learners. Criteria


The learner(s) can: recognise the different ways of strengthening a tower structure. recognise the different forces that are affecting different types of structures.


45 Yes Partly No


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61