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### 18 Cards in this Set

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 if you double the weight of an object, how much work is required to move it double the work how does a fixed pulley give you an advantage it doesn't multiply the effort force measure of how much of the work put into the machine is changed to useful work put out by a machine efficiency does a fixed pulley give you any advantage in force? no only a change in direction rate at which work is done power MA of inclined plane length of slope/height of slope= l/h what does a MA of more than 1 mean in terms of force effort if being multiplied and you're gaining an advantage in force number of times a machine multiplies the force mechanical advantage watt unit of power how to reduce friction for better efficiency use a lubricant so there's less friction Power work/time what is a system of pulleys working together called block and tackle work= force * distance why is the MA of a fixed pulley always 1 b/c it doesn't multiply the force what things are a simple machine able to do change direction, change size, both, do work the 2 groups all simple machines fall into lever or inclined plane MA for a lever length of effort arm/ length of resistance arm MA for wheel and axle radius of wheel/radius of axle