Hi,(adsbygoogle = window.adsbygoogle || []).push({});

I am trying to find the speed it takes to open a yo-yo clutch, against a spring, to its maximum, the problem im stuck on is whether you have to use F cos 90 - θ to get the centripetal force or if you have to do this in reverse eg. Fc = F / cos 90 - θ. I ask this because if you start with v using Fc = ω r you can find the centripetal force. You then can resolve it through cos 90 - θ to get the vertical component acting on the ball bearing. Then using moments you can model the clutch as a lever, and find the force exerted by the spring on the lever when it is opened to maximum. So, if you know the force exerted by the spring, working backwards, you should be able to find the speed. So, when you come to resolving the the force from the ball bearing, i think you should use the second one, Centripetal force = F / cos 90 - θ but i am not sure. Please help

thank you,

Gilmore

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Centripetal force yo-yo problem

**Physics Forums | Science Articles, Homework Help, Discussion**