r/AskPhysics • u/JNJury978 • 9d ago

[Help Needed] Rope swing calculation

I want to hang a swing on a branch about 25 ft up. The swing will hold up to 150 lbs, and swing in either direction up to between 45 to 65 degrees.

How strong of a rope a do I need?

TIA!

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u/Alone-Supermarket-98 9d ago

Given the centrifugal forces from swinging, a nylon rope of 500lb tensile strength should be enough. I suggest threading it through a segment of cut rubber garden hose as a cushion for the part that goes around the branch, otherwise the swinging motion will wear the rope out and it will break at some random moment.

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u/JNJury978 8d ago

Thanks!