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How does a single fixed pulley like the one seen here help you do work?
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How does a pulley help you do work?
A single pulley is one of the "simple machines" in physics, and makes work seem easier by redirecting the action required to work along with gravity. For example, you can lift something by by pulling down on a rope.<br><br>Multiple pulleys make work even easier, but you need to do more of it: running a rope through six pulleys will make the load seem 1/6 as heavy, but you'll have to pull the rope six times as far.<br><br>A handy guide to the simple machines is here: http://teacher.scholastic.com/dirtrep/Simple/pulley.htm<br>
What is the difference between a pulley and a sheave?
A pulley has a bearing that it rides on and a sheave wheel usually has a brass sleeve in it to ride on. A pulley usually has a higher rpm and can take more stress than a sheave wheel. Sheave wheels can have bearings in them, but open ones as opposed to sealed ones in a pulley. Again this has to do with the amount of load required.It is possible there is no difference. Sailors usually call the 'pulleys' on their boats. 'sheaves'. pronounced 'shivs'. Anyway, the word 'sheave' in English originated in German and means 'pulley'. so go figure.*************OK, so here's a 30-year mechanic's answer. Regardless of what the original terminology was, I believe it has come to mean this: A sheave is a pulley wheel (now referred to as a pulley without the word wheel) that has a grooved circumference. Its original purpose was to transmit and/or multiply mechanical power because it is part of a lever system. A pulley also transmits power, but it is not grooved. Examples: 1) the idler pulley of your car engine, which usually acts as a spring loaded belt tensioner. 2) the guide pulley (known as a sprocket) that shifts the chain from one sprocket to another on the back of a bicycle. 3) the drive belt pulley on a farm tractor used to power old fashioned implements. None of these have grooves.So, a sheave is a pulley, but a pulley is not a sheave. Either word should get your point across. It has nothing to do with bearings versus bushings. BTW, a "bushing" used as a load bearing surface is really a bearing, it's just not a roller, tapered roller or ball bearing, but that's another argument.
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wiki answers does not yet have an answer to this question. If you know it feel free to submit your answer here
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