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Stonehenge and its Environs »
The bluestone debate
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Steve Gray
Steve Gray
931 posts

Re: The bluestone debate
Nov 18, 2008, 21:10
tonyh wrote:
But also increase the friction..


Not true. It's a popular misconception. Friction depends only on the characteristics of the two surfaces (coefficient of friction) multiplied by the weight. The area of contact does not enter into the equation, except if it changes the characteristics of the surfaces (for example by deformation) and thus alters the coefficient of friction.

Since an increased area actually reduces deformation it also reduces the friction.

There would, of course, be an small increase due to the additional weight of the sledge, but that would be relatively minor in comparison to the weight of the stone and it would be compensated for by the fact that the coefficient of friction of wood is generally less than that of stone.
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Re: The bluestone debate (tonyh)
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