Physics!

Thanks to the presentation in class, and seeing the different force vectors applied to each part of the trusses, we saw the part the had the most tension was the bar running up the middle of the trusses. And since that, or the bottom middle beam, were the parts the broke for everybody's bridges, it proves the physics. To fix this, we would just reinforce the middle with stronger glue connections, and also make sure that bottom tube piece is folded stiffly, and securely.

The final test. The bridge held 4057 grams of sand plus the weight of the bucket. It had an original weight of 15.9 grams, and so the efficiency, is 255.157. So overall not bad and not great

It's finished!!! Colored for effect. The bottom bars are a little wavy but when pressure will be applied to the bottom connector, it will straighten out quite nicely. It's mass was measured to be 15.9 grams.

Trusses

Finally finished both of the trusses. All of the cutting was done already and we just had to pin the template down and match up the pieces and glue. Nothing too difficult today, just time consuming.

Today we finished folding and glueing the tubes. We also finished cutting everything else which means we are ready to start construction tomorrow.

Today we finished cutting the tubes and building both trusts.

So far we have cut all the pieces and gussets. I folded the tubes and glued them down and they will be cut to size tomorrow. The gluing of the tubes was difficult sometimes due to the sticky fingers, but they are done. Cutting out the gussets worked best when we put the folder on top of something softer such as a notebook.