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Pulleys
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What type of pulley is a CRANE?
Combination
What type of pulley is a GARAGE DOOR MECHANISM?
Moveable
What type of pulley is on a SAIL BOAT?
Moveable
What type of pulley is a WINDOW SHADE / BLINDS?
Fixed
What kind of pulley is a CLOTHESLINE?
Fixed
What kind of pulley is a FLAG POLE?
Fixed
Number of rope segments determines the Mechanical Advantage.
Combination
One pulley supports the load with 2 ropes. Mechanical Advantage = 2
Moveable
Load is supported with one rope. Mechanical Advantage = 1
Fixed
Less and less effort is required to lift heavy loads as more pulleys are added.
Combination
Lifting requires less force than without pulley, but it must be applied over a greater distance.
Moveable
In theory, lifting takes the same effort as lifting without the pulley. In practice, effort must be greater than load.
Fixed.
Distance the load moves comparison to the applied effort force will depend on the number of pulleys
Combination
The load moves half the distance that the rope is pulled by the effort.
Moveable
Load moves the same distance that the rope is pulled by the effort.
Fixed.
Effort is applied by pulling up.
Moveable
Effort is always applied by pulling down, to work with force of gravity
Fixed or Combination
Pulley and load move when rope is pulled.
Moveable.
Doesn't move when rope is pulled; rotates in place.
Fixed
Two or more sets of pulleys connected by the same rope. Upper set doesn't move, lower set does.
Combination
Attached directly to the load being lifted.
Moveable
Fixed to a supporting structure. Not directly attached to the load.
Fixed.
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