How do Pulleys work?

[S2 Science & beyond: Forces] Pulleys often offer a mechanical advantage. But what does that actually mean? The following video helps to clarify some of your doubts. If you still remember your formulae (I hope you do! You awesome, clever kiddo who actually bothers reading this blog) you might recall that Work Done = Force Applied x Distance in the direction of the force. (W = F x D) To summarise, a pulley maintains the total amount of work done (W) by increasing the distance required (D) in order to lower the amount of force required (F). By doing so it would make weak engines with a low amount of force be capable of getting work done via large distances. Fun factoid: Archimedes of Syracuse

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