Monday, November 21, 2016

This is us showing the school assembly how different types of bridges work. We have been studying bridges for three weeks in Inquiry. We have learnt that there are five basic types of bridge. The Bean Bridge, like the Pontchartrain Causeway in the USA. The Arch Bridge, like the Sydney Harbour Bridge in Australia. The Cantilever Bridge, like the Forth Railway Bridge in Scotland. The Suspension Bridge, like the San Francisco Golden Gate Bridge and the Cable Stayed Bridge, like the Russky Bridge in Russia. Mr Robinson needed a favour so we through our assembly item together in an hour and a half and it was a triumph. Here are some photo's of our demonstration of the bridge types. You may need to use a little imagination but that's the all part of the fun.
Our presenters.

A Beam Bridge

An Arch Bridge

A Cantilever Bridge

A Suspension Bridge

A Cable-Stayed Bridge

Tuesday, November 1, 2016

As part of our Inquiry topic of Bridges we tested the strength of a cylinder shape today. We found that most bridges have supports which are cylinder shape somewhere in there construction. These are usually sunk into water and hold the frame of the bridge up. We rolled 6 pieces of paper up and placed a maths text book on them. Then we started stacking. And we stacked, and stacked and stacked until we had 33 maths text books on the cylinders. Eventually the 'compression force' of the weight of the books made the cylinders collapse, but it demonstrated the strength that a basic shape can have and why they are used in construction.