NewScientist The Last Word - Tag 'friction' details

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What makes your fingers get a grip after licking them when opening plastic bags and sleeves? In order to open polythene bags and those A4 plastic paper sleeves you need to wet your fingers, but too wet or completely dry and your fingers can't get a grip.
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Last edited on: 2010-12-05 23:08:34

Categories: Technology.

Why does a capstan grip a wet rope more than a dry one?
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Categories: Technology.

Does friction depend upon surface area? If friction isn't dependant on surface area but only on the coefficient of friction between two surfaces and the reaction force, (F=uR), then why do racing cars use bigger tyres with a greater contact patch to gain better traction?
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Categories: Technology.

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