To figure this out, we placed a coin on top of different materials, gradually raised one end of the material until the coin began to slide, and measured the angle using a protractor. The idea being, the steeper the angle necessary to get the coin moving, the greater the friction between the material and the coin.
Next week we hope to apply our results to the larger question: What can you do to reduce the friction on playground slides? Let's hope for good weather!
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