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Authoritative PPT Summary
"Lever" Mechanical and Work PPT Courseware 2
Five elements of leverage:
Fulcrum (o): The point around which the lever rotates
Power (F1): the force that causes the lever to rotate
Resistance (F2): the force that hinders the rotation of the lever
Power arm (L1): the vertical distance from the fulcrum to the power line of action
Resistance arm (L2): the vertical distance from the fulcrum to the resistance line
(Line of action of force: point of action of overforce, straight line along the direction of force)
Based on the relationship between the force arms, determine what type of lever each is in Figure 8-31 on page 81 of the textbook.
Labor-saving lever, pry bar, screwdriver, guillotine, water pump
Labor lever, foot pedal, tweezers
Equal arm lever balance
Five elements of leverage:
Labor-saving lever Power arm>Resistance arm
effort lever power arm
Equal arm lever power arm = resistance arm
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