How can I double the distance of a pulled object using a scissor system?

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A user is developing a school project requiring a system where a pulled object moves twice as far as the pulling object. They recall a pulley system that could achieve this but need assistance in identifying it. Suggestions include searching for "block and tackle" systems. Ultimately, the user decides to utilize a scissor system for their project, believing it to be the most effective solution. The discussion highlights the importance of exploring different mechanical systems for achieving specific movement ratios.
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I'm working on a project for school and I have to come up with a system where a pulled object moves twice as far as the object doing the pulling. I think I've seen a pulley system that can do this, but I can't remember where. If anyone has any suggestions, I would greatly appreciate it.
 
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Have you searched on "block and tackle"?
 
Thanks for your replys, I think I'm going to go with a scissor system. I think that may work best in my project.
 
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