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A machine is any mechanical or organic device that transmits or modifies energy to perform or assist in the performance of tasks. It normally requires some energy source ("input") and accomplishes some sort of work.

People have used mechanisms and machines to amplify their abilities since before written records were available. Generally these devices decrease the amount of force required to do a given amount of work, alter the direction of the force, or transform one form of motion or energy into another.

The mechanical advantage of a simple machine is the ratio between the force it exerts on the load and the input force applied. This does not entirely describe the machine's performance, as force is required to overcome friction as well. The mechanical efficiency of a machine is the ratio of the actual mechanical advantage (AMA) to the ideal mechanical advantage (IMA). Functioning physical machines are always less than 100% efficient.

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L.A. Times - Home & Garden

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Denver Post: Lifestyle

Ask Amy
editor@denverpost.com (By Amy Dickinson / Tribune Media Services) Fri, 29 Aug 2008 15:39:51 -0600
by Amy Dickinson
Time for politics — and art
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It felt like a real party in Denver's historically black neighborhood, where around 350 people gathered to watch Barack Obama accept the nomination.

 
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