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Making WORK easier!

Making WORK easier!. Types of Simple Machines. Pulley. Inclined Plane. Lever. Wheel and axle. Wedge. Screw. Why do we use them?. Machines make work easier (NOT less) by changing either the:. Size of the force. Direction of the force. 50 kg. Mechanical Advantage.

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Making WORK easier!

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  1. Making WORK easier!

  2. Types of Simple Machines Pulley Inclined Plane Lever Wheel and axle Wedge Screw

  3. Why do we use them? • Machines make work easier (NOT less) by changing either the: Size of the force Direction of the force

  4. 50 kg

  5. Mechanical Advantage The number of times a machine multiplies your applied force is the ACTUAL mechanical advantge Resistance Force (weight of object) M.A. = Fr Fe Effort Force (force YOU are supplying) Mechanical Advantage

  6. Resistance Force Fr Effort Force Fe

  7. Ideal Mechanical Advantage The number of times a machine SHOULD multiply your applied force I.M.A. = depends on type of machine Ideal Mechanical Advantage

  8. Efficiency Measure of how much work put into a machine is changed to useful work put out by the machine. M.A. I.M.A. X 100 Efficiency =

  9. Work • Energy is conserved  in “ideal” machines, the work you put in is equal to the work the machines gives out • “Real” machines  you do MORE work than machines give back out • Why use them??? W = F·d W = F·d

  10. Parts of a lever Fe dr Resistance distance Fr de Fulcrum Effort distance

  11. Three classes of Levers 2nd class lever 1st class lever 3rd class lever

  12. 1st class levers

  13. 2nd class lever

  14. 3rd class lever Fulcrum Effort Force Mechanical Advantage is LESS than 1 Resistance Force

  15. Which class lever?

  16. IMA - Levers • The number of times a lever SHOULD multiply your applied force I.M.A. = de dr Effort distance Resistance distance

  17. Fe Fr Inclined plane Wout = Fr·dr Win = Fe·de

  18. Ideal Mechanical Advantage - Inclined Plane IMA = L h Big Bang Theory clip L h

  19. Works Cited http://www.uen.org/utahlink/activities/uploads/6528_a_screw.jpg http://www.beth.k12.pa.us/schools/wwwclass/mcosgrove/simplemachines.gif http://www.school-for-champions.com/science/images/machines4.gif http://www.ent.ohiou.edu/~bobw/html/HapEd/NASA/SimpMach/cl2lever.gif http://library.thinkquest.org http://www.the-office.com/summerlift/pulley1.gif http://encyclozine.com/Science/Physics/Machines/incline.gif http://www.fi.edu/pieces/knox/automaton/images/thewedge.gif http://www.worsleyschool.net/science/files/wheel/diagram1.gif http://www.metro-region.org/imageRepository/ACFQWB8ebaLm.gif http://www.ccohs.ca/images/MMH136.gif http://www.dynamicscience.com.au/tester/solutions/hydraulicus/animatedfourpulley.gif http://juniorengineering.usu.edu http://www.technologystudent.com/images3/lpulle23.gif http://www.sciencebuddies.org/mentoring/project_ideas/ApMech_img007.jpg http://www.gutenberg.org/files/16593/16593-h/images/image_110.jpg http://discover.edventures.com/images/termlib/s/screw/support.gif http://selland.boisestate.edu/jbrennan/physics/images/ http://members.aol.com/crummybut/splittingwood.jpg

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