[Mechanics] Circular motion outside sphere

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SUMMARY

The discussion focuses on determining the angle θ at which a marble leaves a sphere during circular motion. The key concept is that the marble will detach from the sphere when the normal force becomes zero. To solve this problem, one must apply the principles of conservation of energy and centripetal force. The marble starts with zero velocity at the top of the sphere and requires a light push to initiate motion.

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  • Understanding of circular motion mechanics
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  • Familiarity with conservation of energy principles
  • Basic physics concepts related to forces and motion
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  • Study the derivation of centripetal force equations in circular motion
  • Learn about the conservation of mechanical energy in physics
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sushichan
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Homework Statement


A marble rolls from the top of a big sphere. What is the angle θ when the marble is about to leave the sphere? Assume a zero speed at the top.

Homework Equations


The question came from the chapter Mechanics - circular motion.

The Attempt at a Solution


I can't conceive what that instant moment means to the acceleration or velocity of the marble.
 
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I don't really understand your question. Do you have any ideas how to solve this problem?
 
Assumption:A light push is given to the marble.it starts to fall with 0 velocity.
The moment when the ball 'leaves the sphere' is when the normal force between them is 0. Apply conservation of energy and make an expression for centripetal force at the instant when the normal force exterted by the marble is 0.
 

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