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Comparing the strength of solid wood with that of plywood Featured science projectScience project video

Conclusion

The hypothesis that the solid wood will be stronger than the plywood is proven to be true.

Solid wood furniture looks nicer and lasts longer but is more expensive. Another problem with solid wood is that their sizes are limited  by the size of the trees. This means more joints are required for larger projects. Plywood on the other hand can be bought at a fraction of the cost of solid wood. It can also be manufactured to  larger sizes, making it more convenient to be used in woodworking projects.

Also consider

What would happen if the science fair project were to be repeated to include oriented strand board (OSB) and fiberboard?

Try  repeating the experiment  using different widths of wooden planks to compare the results.
 

References

Types of wood - http://www.sawdustmaking.com/Wood/wood.html

What is plywood? - http://www.wisegeek.com/what-is-plywood.htm
 

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Complexity level:
7
Project cost ($):
70
Time required:
1 hour to prepare, 6 hours for observation
Material availability:
Easily found
Safety concerns:

Ensure that safety equipment (gloves/goggles) are worn when handling power tools. Tools should be handled only by an adult