K'nex Bridge Challenge

A big storm has washed away part of the main road near your school. A child in the school is very ill and the ambulance can’t get through. We need your help – can you design and build a bridge that can carry the ambulance across the gap in the road?

The Bridge should:

• be able to support a relative weight in the middle
• Be at least 30cm long
• Can you extend it without a gap?

Things to think about:

• How can you make your bridge really strong?
• Try out your ideas on a short bridge – does it break or sag in the middle?
• Can you increase the length while still maintaining strength?
• Can you improve your design even further? 

Good luck!