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Which reduces friction more: #40 oil, #10 oil, or an edible oil?
Do this first:
Coat one side of the boards and blocks with very thin layers of oil. Rub them down with paper towels. Don't leave any extra oil on them!
Raise the board to make an inclined plane. Drop the block gently onto the board at bigger and bigger angles until the block slides quickly downhill. Record the angle at which the block slides best.
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