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FIRST CLASS LEVER: CLAW USED HAMMER TO REMOVE NAIL
Hammer Handle As Lever
When an effort force (in this case arm muscle) is applied to a lever (the handle of the hammer) the lever moves about the fulcrum (the top of the hammer) and overcomes a resistance force (pressure of the wood against the nail).
Copyright:© 1991 Richard Megna - Fundamental Photographs
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