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Mechanical Advantage

Mechanical Advantage. Pg. 280 Teacher: Ms. Barnard. Simple machines in the body. The body is made up of multiple levers There is no wheel and axle in the body http://www.dynamicscience.com.au/tester/solutions/hydraulicus/humanbody.htm

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Mechanical Advantage

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  1. Mechanical Advantage Pg. 280 Teacher: Ms. Barnard

  2. Simple machines in the body • The body is made up of multiple levers • There is no wheel and axle in the body • http://www.dynamicscience.com.au/tester/solutions/hydraulicus/humanbody.htm • http://www.peworld.org/student_resources/powerpoint/levers/sld012.htm

  3. Review transmission • What is transmission? • Large force to move objects slowly OR a smaller force to move objects quickly • Transmission Lego • In first gear, what was the size of the driving gear? • What about in third gear?

  4. A machine can make work easier by increasing the force exerted • Mechanical Advantage (MA) = Output force Input force • MA can also be called the force ratio

  5. Output force = the force the machine applies on the object • Input force = the outside force that is applied to the machine

  6. MA clip • http://www.neok12.com/php/watch.php?v=zX5d6f5f6f6807494046007b&t=Simple-Machines

  7. MA example • MA = Fo/Fi • You apply 20N to a lever to lift a 144N weight. • What is the mechanical advantage?

  8. Homework • Work through the worksheet. • Read pg. 280-282, 284-286

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