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Pulley

By Jonathan Lemmon and Brook Dreher. Pulley. Definition of Pulley. a wheel with a grooved rim for carrying a line, that turns in a frame or block and serves to change the direction of or to transmit force, as when one end of the line is pulled to raise a weight at the other end.

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Pulley

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  1. By Jonathan Lemmon and Brook Dreher Pulley

  2. Definition of Pulley • a wheel with a grooved rim for carrying a line, that turns in a frame or block and serves to change the direction of or to transmit force, as when one end of the line is pulled to raise a weight at the other end

  3. How does it work? • A pulley is also called a sheave or a drum and is a mechanism made up of a wheel on an axle or shaft that may have a groove between two flanges around its boundary. • A rope, cable, belt, or chain usually runs over the wheel and inside the groove, if present. • Pulleys are used to change the direction of an applied force, or realize a mechanical advantage in either a linear or rotational system of motion

  4. It looks like this

  5. Uses • The pulley is used to move heavy objects by splitting the weight being pulled. Like a crane, it lifts up objects easily by using hydraulics in the arm so it is able to pull objects

  6. How do you calculate IMA for the pulley • Efficiency=AMA/IMA x 100% • AMA=Fr /Fe

  7. Other info on pulleys • The pulley you turn causes the other pulley to turn also, because they are connected by a belt. The driver and the follower turn in the same direction.

  8. Reference • http://www.eng.iastate.edu/twt/Courses/Undergrad/packet/info/pulleys.htm • The book • http://en.wikipedia.org/wiki/Pulley

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