Calculating the Period Time of a Ball Inside a Ball

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To calculate the period time of a ball inside another ball, it's essential to analyze the equations of motion, considering the densities of both balls and the friction present on the surface. The discussion emphasizes the importance of conservation laws in this scenario. A key point raised is the need to clarify whether there is zero friction between the two balls, as this could significantly impact the calculations. The conversation suggests that understanding the dynamics of the system is crucial for deriving the period time. Overall, a thorough examination of the forces and motion involved is necessary to solve the problem effectively.
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Homework Statement



As you can see, I have a ball inside a ball.
One with a density p1 and the other p2.
the ball stand on a surface with friction so it can move without sliding.
they move the ball from its rest point and release it.
I need to figure out the period time, any idea?


Homework Equations





The Attempt at a Solution

 

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asi123 said:
As you can see, I have a ball inside a ball.
One with a density p1 and the other p2.
the ball stand on a surface with friction so it can move without sliding.
they move the ball from its rest point and release it.
I need to figure out the period time, any idea?

Hi asi123! :smile:

(is there zero friction between the balls?)

The only way to approach this is to work out the equations of its motion first.

Hint: lots of things are being conserved. :wink:
 

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