Building a Newspaper Bridge - Physics Homework

[Frillth]

Homework Statement

In physics class, we are now starting to build free standing newspaper bridges. We are allowed to use only newspaper and glue, but we can use as much of those as possible, as long as it meets the following conditions:

1. It must be less than 254 g (don't ask me why).
2. It must be longer than 40 cm.

The bridges will be stress tested by placing them on top of blocks that are 40 cm apart. A pneumatic piston with a rectangular plate on it (I don't know the exact dimensions of the plate, but I can find out tomorrow) will push down on the bride until it breaks.

Homework Equations

None known.

The Attempt at a Solution

I was thinking of building a Warren truss bridge, as shown at:
http://abcdpittsburgh.org/kids/kids.htm
I'm not sure about the actual specifics, though. We haven't really learned anything about what makes a good bridge in class, but I'm thinking that the bridge's width should be equal to the plate's width for maximum weight distribution. Can I get some input?

Sorry if I put this in the wrong forum. I wasn't sure if I should post this under physics or engineering or in homework or general.

 

[berkeman]

Sorry to ask such an obvious question, but this is such a common project, have you tried google? You would save us a lot of time if you could say what you've found on google so far, and what you'd like to improve through creative physics...

 

[m2003]

I would say that this is a great opportunity for you to apply your knowledge of physics principles to a real-life situation. Building a newspaper bridge is a great way to understand the concepts of structural stability, weight distribution, and force exertion. The Warren truss design is a good choice as it distributes weight and forces evenly, but there are also other designs that you can explore and experiment with.

In terms of the bridge's width, it is important to consider the dimensions of the plate that will be used for the stress test. A wider bridge may distribute weight better, but it may also increase the overall weight of the bridge, which could affect its strength. It would be helpful to calculate the maximum weight that your bridge can hold based on the dimensions and weight limit given in the homework statement.

Additionally, as a scientist, it is important to always document your experiments and observations. Keep track of the different designs you try, the weight they can hold, and any other variables that may affect the bridge's strength. This will help you analyze your data and make informed decisions in the future.

Overall, building a newspaper bridge is a great way to apply your knowledge of physics and learn more about structural engineering. I wish you all the best in your project and encourage you to continue exploring and experimenting with different designs.