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Surfaces Affect The Speed Of A Toy Car

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The purpose of my experiment was to determine how different surfaces affected the speed of a toy car. My hypothesis was that if I change the surface to concrete then the speed of the toy car will increase because the car will have more traction, due to the rough texture, giving it more acceleration, giving it more speed. My results showed that when I changed the surface to asphalt then the speed of the toy car increased. I know this because the toy car had the highest speed of 2.8 miles per hour on the asphalt surface. My hypothesis was supported because I had predicted that the toy car would perform the fastest on the asphalt surface, and it did. I thought that if I change the surface to concrete then the speed of the toy car will increase

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