1. Rope Bridge
Rope Bridge Broken bridge
Episode 1:
Broken bridge 1

2. Objectives: Rope Bridge Broken bridge
To explain the meaning of the scientific term ‘force’
To analyse a range of bridge designs
To investigate the forces acting on a model bridge
Rope Bridge Broken bridge

3. Rope Bridge Broken bridge
Hello everybody. Our company has been given the contract to repair the rope bridge in
Kotyaevka village. The villagers have come to us because their existing bridge has collapsed and they need it repairing or replacing quickly.
Engage
Rope Bridge Broken bridge

4. Rope Bridge Broken bridge
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Rope Bridge Broken bridge
This bridge is seriously damaged! It will need replacing. But is a rope bridge the best sort of crossing for the river here? 4

5. Rope Bridge Broken bridge
Maybe we should just build a pier across the river out of stones and earth like this one in China?
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Rope Bridge Broken bridge

6. Rope Bridge Broken bridge
This is flat and uses bamboo poles for the railings at the sides.
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7. Rope Bridge Broken bridge
Or steel wires and wood like this one?
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Rope Bridge Broken bridge

8. Rope Bridge Broken bridge
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Rope Bridge Broken bridge
And how about a stone one with lots of lights on it - like this one in Amsterdam?

9. Rope Bridge Broken bridge
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Rope Bridge Broken bridge
And how about this way to get across the river? 9

10. Rope Bridge Broken bridge
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Rope Bridge Broken bridge
Or maybe people should just use boats?

11. Rope Bridge Broken bridge
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Please decide what sort of bridge or river crossing would be best for our village. Remember to think about:
what it will need to carry?
how long it will take to build?
how far it has to reach?
how much it will cost?
how easy it will be to repair if some parts fail?
Please work in teams to come up with the best sort of crossing for the river - and be ready to give me your reasons!
Rope Bridge Broken bridge

12. Rope Bridge Broken bridge
Explore
What forces act on the bridge ?
What experiment could we do to tell us about the forces acting on the bridge?
What is holding the bridge up?
Rope Bridge Broken bridge
How could the forces have damaged the bridge?
Is it gravity? That has something to do with the weight?
SS1

13. Rope Bridge Broken bridge
How could the bridge have been damaged ? Here are two pictures of bridges that have failed in different ways. What caused them to break?
How could we make a stronger bridge?
Explain
Rope Bridge Broken bridge

14. Rope Bridge Broken bridge
Elaborate
You’ve probably noticed some bridges are flat but some bend downwards and others bend up. Does the shape make any difference to the strength of the bridge?
Rope Bridge Broken bridge

15. Rope Bridge Broken bridge
Draw force arrow to show how the different force act on the bridge.
Evaluate
Rope Bridge Broken bridge
SS3

16. Rope Bridge Broken bridge
Draw force arrow to show how the different force act on the bridge.
Evaluate
Rope Bridge Broken bridge
SS3

17. Rope Bridge Broken bridge
Draw force arrow to show how the different force act on the bridge.
Evaluate
Rope Bridge Broken bridge
SS3