A ball of mass m is being pushed off the top of a frionctless semi dome by a small negligible force. Find the angle where the ball left the surface.(adsbygoogle = window.adsbygoogle || []).push({});

I know how to solve this problem, but I don't understand the concept behind it.

Why does the normal force have to equal the centripeal force at the angle of departure a??

ie mg cos a = mv^2/R

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# Need Help with Concept

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