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SIMPLE MACHINES - LEVER

SIMPLE MACHINES - LEVER. SIMPLE MACHINES - LEVER. A lever is a rigid bar that rotates around a fixed point called the fulcrum. The bar may be either straight or curved. In use, a lever has both an effort (or applied) force and a load (resistant force). . SIMPLE MACHINES - LEVER.

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SIMPLE MACHINES - LEVER

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  1. SIMPLE MACHINES - LEVER

  2. SIMPLE MACHINES - LEVER • A lever is a rigid bar that rotates around a fixed point called the fulcrum. • The bar may be either straight or curved. • In use, a lever has both an effort (or applied) force and a load (resistant force).

  3. SIMPLE MACHINES - LEVER Anatomy of a lever

  4. SIMPLE MACHINES - LEVER The 3 Classes of Levers The class of a lever is determined by the location of … - the effort force - the load and - the fulcrum.

  5. SIMPLE MACHINES - LEVER The 3 Classes of Levers Use “FLE123” as a way to remember the class of a lever. The letter represents the part in the middle of the lever and the number is the class of lever. F1 – 1st class with Fulcrum in middle L2 – 2nd class with Load in middle E3 – 3rd class with Effort in middle

  6. SIMPLE MACHINES - LEVER First-class lever In a first-class lever the fulcrum is located at some point between the effort and resistance forces.

  7. SIMPLE MACHINES - LEVER Anatomy of a first-class lever

  8. SIMPLE MACHINES - LEVER First class lever Common examples of first-class levers include crowbars, scissors, pliers, tin snips and seesaws.

  9. SIMPLE MACHINES - LEVER First class lever • First-class lever always changes the direction of force (I.e. a downward effort force on the lever results in an upward movement of the resistance force).

  10. SIMPLE MACHINES - LEVER First-class lever Fulcrum is between EF (effort) and RF (load). Effort moves farther than Resistance. Multiplies EF and changes its direction.

  11. SIMPLE MACHINES - LEVER First-class lever The closer the fulcrum is to the load, the easier it is to lift objects. The longer the effort arm, the less effort force is needed to lift the object.

  12. SIMPLE MACHINES - LEVER Second-class lever In a second-class lever the load is located between the fulcrum and the effort force.

  13. SIMPLE MACHINES - LEVER Anatomy of a second-class lever load Effort distance Resistance distance fulcrum effort

  14. SIMPLE MACHINES - LEVER Second-class lever Common examples of second-class levers include nut crackers, wheel barrows, doors, and bottle openers.

  15. SIMPLE MACHINES - LEVER Second-class lever - A second-class lever does not change the direction of force. - When the fulcrum is located closer to the load than to the effort force, an increase in force (mechanical advantage) results.

  16. SIMPLE MACHINES - LEVER Second-class lever The closer the fulcrum is to the load, the easier it is to lift objects. The longer the effort arm, the less effort force is needed to lift the object.

  17. SIMPLE MACHINES - LEVER Second-class lever RF (load) is between fulcrum and EF Effort moves farther than Resistance. Multiplies EF, but does not change its direction.

  18. SIMPLE MACHINES - LEVER Third-class lever With a third-class lever, the effort force is applied between the fulcrum and the resistance force.

  19. SIMPLE MACHINES - LEVER Anatomy of a third-class lever load Effort distance Resistance distance fulcrum effort

  20. SIMPLE MACHINES - LEVER Third class lever • Examples of third-class levers include tweezers, hammers, and shovels.

  21. SIMPLE MACHINES - LEVER Third-class lever • A third-class lever does not change the direction of force. • A third-class lever always produce a gain in speed and distance and a corresponding decrease in force.

  22. SIMPLE MACHINES - LEVER Third-class lever The closer the effort is to the load, the easier it is to lift objects. The longer the effort arm, the less effort force is needed to lift the object.

  23. SIMPLE MACHINES - LEVER Third-class lever EF is between fulcrum and RF (load).Does not multiply force. Resistance moves farther than Effort. Multiplies the distance the effort force travels.

  24. SIMPLE MACHINES – LEVER“FLE123” First-class lever Second-class lever Third-class lever Fulcrum is between EF (effort) and RF (load). Effort moves farther than Resistance. Multiplies EF and changes its direction. EF is between fulcrum and RF (load). Resistance moves farther than Effort. Does not multiply EF. Multiplies the distance the effort force travels. RF (load) is between fulcrum and EF Effort moves farther than Resistance. Multiplies EF, but does not change its direction.

  25. SIMPLE MACHINES – LEVERTrade-off First-class lever Second-class lever Third-class lever Fulcrum is between EF (effort) and RF (load). Requires less EF, but, load moves only a short distance. Multiplies EF and changes direction of force. EF is between fulcrum and RF (load). Requires most EF, but load moves greatest distance. Does not multiply EF. Multiplies the distance the effort force travels. RF (load) is between fulcrum and EF Requires more EF, but, load moves larger distance. Multiplies EF, but does not change its direction.

  26. SIMPLE MACHINES“FLE123”

  27. SIMPLE MACHINES - LEVER A B C

  28. SIMPLE MACHINES - LEVER What do you know ? Let’s find out!

  29. SIMPLE MACHINES - LEVER What class of lever is this? 1st 2nd 3rd

  30. SIMPLE MACHINES - LEVER What class of lever is this? 1st 2nd 3rd

  31. SIMPLE MACHINES - LEVER What class of lever is this? 1st 2nd 3rd

  32. SIMPLE MACHINES - LEVER What class of lever is this? 1st 2nd 3rd

  33. SIMPLE MACHINES - LEVER What class of lever is this? 1st 2nd 3rd

  34. SIMPLE MACHINES - LEVER What class of lever is this? 1st 2nd 3rd

  35. SIMPLE MACHINES - LEVER What class of lever is this? 1st 2nd 3rd

  36. SIMPLE MACHINES - LEVER What class of lever is this? 1st 2nd 3rd

  37. SIMPLE MACHINES - LEVER What class of lever is this? 1st 2nd 3rd

  38. SIMPLE MACHINES - LEVER Anatomy of a lever A. D. B. E. C.

  39. SIMPLE MACHINES - LEVER Anatomy of a lever B. E. C. D. A.

  40. SIMPLE MACHINES - LEVER Anatomy of a lever E. A. D. B. C.

  41. SIMPLE MACHINES - LEVER Which class of lever multiples force but only moves the load a short distance? 1st 2nd 3rd

  42. SIMPLE MACHINES - LEVER Which class of lever moves the load the greatest distance but requires the greatest effort force? 1st 2nd 3rd

  43. SIMPLE MACHINES - LEVER Which class of lever multiplies effort force and changes direction of force? 1st 2nd 3rd

  44. SIMPLE MACHINES - LEVER Which class of lever multiplies effort force, but does not change its direction? 1st 2nd 3rd

  45. SIMPLE MACHINES - LEVER Which class of lever does not multiply effort force but does multiplies the distance the effort force travels? 1st 2nd 3rd

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