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Simple machines. Levers. Technology.

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  1. 1. Simple machines. levers<br />Technology, 1º ESO<br />By Joaquín Ballester<br />
  2. 2. SIMPLE MACHINE<br />A simple machine is a mechanical device that changes the direction or magnitude of a force.<br />They are the simplest mechanisms that use mechanical advantage to multiply force. <br />A simple machine uses a single applied force to do work against a single load force. <br />The work done on the load is equal to the work done by the applied force. <br />They can be used to increase the amount of the output force, at the cost of a proportional decrease in the distance moved by the load. The ratio of the output to the input force is called the mechanical advantage.<br />Font: Wikipedia<br />
  3. 3. SIMPLE MACHINES<br />
  4. 4. LEVERS<br />A lever is a rigid object that is used with an appropriate fulcrum or pivot point to multiply the mechanical force (effort) that can be applied to another object (load). <br />
  5. 5. LAW OF THE LEVER<br />
  6. 6. CLASSES OF LEVERS<br />
  7. 7. EXERCISES<br />John weighs 90 Kg and Jane weighs 60 Kg. They are both seating on a seesaw. If John is seated 10 feet away from the pivot, how far should Jane be from the fulcrum of the seesaw to be well balanced?<br />1 foot = 0,3048 metres<br />Peter wants to move a 400 lb rock with a 69 cm crowbar. He puts the fulcrum 9 cm from the rock. How much force must he use to move the rock?<br />1 pound = 0.45 kilograms<br />
  8. 8. EXERCISES<br />Whateffortwouldberequiredtoraise a load of 300N using a 5m leverifthefulcrumis at 1 metre fromtheforcethatweapply?<br />