Study the friction offered by a few surfaces such as plywood, polished leak wood/softwood, glass sheet, laminated plywood etc.
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friction is caused by irregularities of wood
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Friction depends on the roughness of a particular surface.If the surface is more slippery,the friction of that particular surface decreases.
Similarly the objects mentioned in the question,
Polished plywood,glass sheet and laminated plywood has a slippery surface which decreases the total friction amount.
But on the other hand the normal plywood has a rough surface which increases the overall friction.
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