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Put an object (e.g coin) on a board (e.g. a long piece of wood).

Wet the board with enough water to form a continuous layer.

Carefully tilt the board and measure how high one end must be for the object to just start slipping.

It's a good idea to repeat this and work out the average height.

Dry the board and object.

Repeat the process using oil, wuth the same board and object - so it's a fair test.

If the height (needed to make the slipping start) is smaller when using oil, it means the oil reduces friction more than water.

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12y ago

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