Dec 12, 2014 · A tradesman sharpens a knife by pushing it against the rim of a grindstone. The 40cm diameter stone is spinning at 200 rpm and has a mass of 24kg . The coefficient of kinetic friction between the knife and the stone is 0.20.
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Physics (from Ancient Greek: φυσική (ἐπιστήμη), translit. physikḗ (epistḗmē), lit. 'knowledge of nature', from φύσις phýsis "nature") is the natural science that studies matter and its motion and behavior through space and time and that studies the related entities of energy and force.
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