How is a drawbridge a pulley?

Answer:
Drawbridges that use pulleys translate the usually-downward force (on a rope or chain) into a lateral force that lifts the bridge in an arc, upward and inward simultaneously.
In roadway and train bridges, there is usually no pulley, just a counterweight that acts through a lever (a fixed support).
First answer by Dfoofnik. Last edit by Dfoofnik. Contributor trust: 2551 [recommend contributor recommended]. Question popularity: 1 [recommend question].

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