Activity 2 Build an arch bridge Learner’s Book page 24 Guidelines to implement this activity
This is a group activity. • Divide learners into groups of 2–3. • This is similar to the previous activity but uses the arch to support the load.
Assessment guidelines
This activity is intended for informal assessment. Use the checklist below to assess learners. Criteria
Yes
The learner(s) can: work together to build the bridge.
identify the direction of the forces through the arch to the abutments.
name different parts of the structure. Partly No
Activity 3 Build a suspension bridge Learner’s Book page 25 Guidelines to implement this activity
• This is a group activity. • Divide learners into groups of 5–6. • This activity is going to take some time to construct. • The road is placed in position and the vertical strings pass under it and are then tied to the suspended cable on the other side.
Background knowledge
A suspension bridge uses the same principle as an arch bridge but turns it upside down. The curve is created by the cables which are firmly anchored to each side of the river embankment. The cable passes over the top of one of the tall towers and drops downwards to the middle of the bridge before passing over the other tower to the embankment on the other side. The roadway is supported by cables hanging vertically from the long suspended cables on each side of the road.
49
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
