Pully

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Pully

  1. 1. PULLEY
  2. 2. How was the Pulley invented? <ul><li>Ancient origin (1000 B.C.) </li></ul><ul><li>Archimedes (287 B.C. – 212 B.C.) </li></ul><ul><ul><li>Explanation </li></ul></ul><ul><ul><li>Improved technology </li></ul></ul><ul><ul><li>Complex pulleys </li></ul></ul>
  3. 3. How does it effect us? <ul><li>Used in </li></ul><ul><ul><li>Elevator, Escalator </li></ul></ul><ul><ul><li>Washing Machine </li></ul></ul><ul><ul><li>Crane </li></ul></ul><ul><ul><li>Engines </li></ul></ul><ul><ul><li>Blinds (window) </li></ul></ul>
  4. 4. Impact <ul><li>Less work </li></ul><ul><li>Heavy Lifting </li></ul><ul><li>More Efficient Machines </li></ul>
  5. 5. Scientific Principles <ul><ul><li>Fixed </li></ul></ul><ul><ul><ul><li>Changes force direction </li></ul></ul></ul><ul><ul><ul><li>Mechanical advantage 1 </li></ul></ul></ul><ul><ul><li>Moveable </li></ul></ul><ul><ul><ul><li>Multiplies force </li></ul></ul></ul><ul><ul><ul><li>Mechanical advantage 2 </li></ul></ul></ul><ul><ul><li>Compound </li></ul></ul><ul><ul><ul><li>Fixed and moveable combined </li></ul></ul></ul>
  6. 6. Scientific Principles Cont’d <ul><li>Work input = Force of effort / Distance of effort </li></ul><ul><li>Work output = Force of resistance / Distance of resistance </li></ul>
  7. 7. Scientific Principles Cont’d <ul><li>AMA = Force of resistance / Force of effort </li></ul><ul><li>IMA = Distance of Effort / Distance of resistance </li></ul><ul><li>Efficiency = Work output / Work input x 100% </li></ul><ul><li>     </li></ul>
  8. 8. Scientific Principles Cont’d <ul><li>Classified as one of the six simple machines </li></ul><ul><li>At equilibrium force on pulley is 0 </li></ul>
  9. 9. References <ul><li>&quot;Archimedes.&quot; UXL Encyclopedia of World Biography . Ed. Laura B. Tyle. Vol. 1. Detroit: UXL, 2003. 89-91. Gale Virtual Reference Library . Gale. Blue Valley West High School. 3 Feb. 2010 <http://go.galegroup.com/ps/start.do?p=GVRL&u=stil34938>. </li></ul><ul><li>&quot;Hoisting machines.&quot; McGraw-Hill Encyclopedia of Science & Technology . 10th ed. Vol. 8. New York: McGraw-Hill, 2007. 569-572. Gale Virtual Reference Library . Web. 19 Feb. 2010. </li></ul><ul><li>Knight, Judson. &quot;Archimedes and the Simple Machines That Moved the World.&quot; Science and Its Times . Ed. Neil Schlager and Josh Lauer. Vol. 1: 2,000 B.C. to A.D. 699. Detroit: Gale, 2001. 363-365. Gale Virtual Reference Library . Gale. Blue Valley West High School. 3 Feb. 2010 <http://go.galegroup.com/ps/start.do?p=GVRL&u=stil34938>. </li></ul><ul><li>&quot;Mechanical Advantage and Simple Machines.&quot; Science of Everyday Things . Ed. Neil Schlager. Vol. 2: Real-Life Physics. Detroit: Gale, 2002. 157-169. Gale Virtual Reference Library . Gale. Blue Valley West High School. 3 Feb. 2010 <http://go.galegroup.com/ps/start.do?p=GVRL&u=stil34938>. </li></ul>

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