
Solid Wood vs. Plywood Strength
Medium
Which is stronger: solid wood or plywood? You test three types of wood planks, all the same size:
- Oak (a hardwood)
- Redwood (a softwood)
- Plywood
Each plank is clamped to a table with a vice. You hang weights from the free end, adding 0.5 kg at a time, until the plank snaps. Recording the breaking point for four planks of each type gives you an average strength. The results reveal how plywood compares to both hardwood and softwood.
Hypothesis
The hypothesis is that the solid wood will be stronger than the plywood.
Method & Materials
You will compare the strength of solid wood and plywood by drilling a hole in each of the 12 planks, fixing them to a vice, and adding weights until the plank snaps.
You will need 4 oak wood planks, 4 redwood planks, 4 plywood planks, 40 weights, a rope, an electric drill, a ruler, a vice, and a solid table.
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See what’s includedResults
The results of the experiment showed that oak wood, which is a hardwood, could bear the most weight before breaking, while the plywood could bear the least before breaking.
Why do this project?
This science project is interesting because it allows us to compare the strength of different types of wood, and to see which one is the strongest.
Also Consider
Consider repeating the experiment using different widths of wooden planks to compare the results, or try repeating the experiment to include oriented strand board (OSB) and fiberboard.
Full project details
Additional information and source material for this project are available below.Related video
These videos explain the science behind this project and demonstrate key concepts used in the experiment.
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