Pinewood Derby
A look at what is currently available on eBay
 2.48 second Pinewood derby car body. Extended axles. US $10.49 
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 Pinewood derby car for BSA races . Extended axles. US $14.99
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 Pinewood Derby Car Fast Speed Design With Video Documented Times US $299.95
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 Pinewood Derby Car (IronMan) Body US $.99
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 Pinewood Derby Design and Build Items for Maximum Speed US $24.99
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 Pinewood Derby Car (GreenBay Packers Body) US $.99
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 Pinewood Derby Car (Wolf Body) US $.99
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 Pinewood Derby Car (Minnesota Vikings) Body US $.99
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 Lot 2 Vintage Boy Scout Pinewood Derby Race Cars Old Style Wheels US $9.99
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 Pine Car " Wedge" Kit Boy Scouts Pine Wood Derby US $5.95
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 Pine Car "Basic" Kit Boy Scout Pine Wood Derby US $5.95
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 Pinewood Derby Pine Car Wheel Alighment Tool P456 US $2.54
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 Purple "Machine" Pinewood Derby Car US $43.99
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 Blue Low Profile Pinewood Derby Car US $43.99
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 **FAST** Pinewood derby car by (Pinewood Rick) US $69.99
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 **FAST** Pinewood derby car by (Pinewood Rick) US $59.99
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 **FAST** Pinewood derby car by (Pinewood Rick) US $59.99
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 **FAST** Pinewood derby car by (Pinewood Rick) US $79.99
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What is the effect of types of wood on the speed of pinewood derby cars?
I am not in boy scouts I am in the science fair and that is my question if you have any links to places that may help please post them
As a previous answer stated, different woods (and even different pieces of the same type of wood) have different densities and thus different weights and may affect speed accordingly. But if your underlying question is about the impact of materials on speed, your selection of wood is minimal compared to other factors. Since there is a maximum weight allowed for cars your choice of wood would not materially affect your car's speed as much as just buying the regular pinewood kit and using lead stick-on weights to reach the maximum weight (which would also give you the flexibility to place the weight where you wanted it - front, back, center, etc.).
One factor that has a far greater impact on overall performance is making sure the axles are square to the body of your car, because, to paraphrase Jonnie Cochran, if your wheels ain't square, you ain't going nowhere. If your axles are perfectly square to the car body your wheels will turn smoothly and not slow your car down by jumping up and down or wiggling back and forth across your lane.
Another important facter is the "freeness of spin" of your wheels. You can sand the axles and use graphite power for reduced friction.
I'm not sure if this is exactly what you're looking for, but in the grand scheme of things, wood type does not have a great impact on car speed.
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