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Pulleys

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    Identify different kinds of pulleys; 2°ESO Technology
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  • Fixed to a supporting structure. Not directly attached to the load.
    Fixed.
  •  10
  • Attached directly to the load being lifted.
    Moveable
  •  15
  • Two or more sets of pulleys connected by the same rope. Upper set doesn't move, lower set does.
    Combination
  •  15
  • Doesn't move when rope is pulled; rotates in place.
    Fixed
  •  15
  • Pulley and load move when rope is pulled.
    Moveable.
  •  10
  • Effort is always applied by pulling down, to work with force of gravity
    Fixed or Combination
  •  10
  • Effort is applied by pulling up.
    Moveable
  •  20
  • Load moves the same distance that the rope is pulled by the effort.
    Fixed.
  •  20
  • The load moves half the distance that the rope is pulled by the effort.
    Moveable
  •  20
  • Distance the load moves comparison to the applied effort force will depend on the number of pulleys
    Combination
  •  20
  • In theory, lifting takes the same effort as lifting without the pulley. In practice, effort must be greater than load.
    Fixed.
  •  20
  • Lifting requires less force than without pulley, but it must be applied over a greater distance.
    Moveable
  •  20
  • Less and less effort is required to lift heavy loads as more pulleys are added.
    Combination
  •  15
  • Load is supported with one rope. Mechanical Advantage = 1
    Fixed
  •  15
  • One pulley supports the load with 2 ropes. Mechanical Advantage = 2
    Moveable
  •  15
  • Number of rope segments determines the Mechanical Advantage.
    Combination
  •  15