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

I'm a UG in mechanical engineering and I've a basic understanding of (but a very keen interest in) physics.

Before I get started, I just want to say that this is not my homework.

So there's this problem that's been in my head for a while. I don't know enough physics to solve it so I came here to seek help. Thanks to anyone who responds.

There are two masses (m1 and m2, say) that can rotate about an axis. m1 is at a distance of r1 from the axis and m2 at r2. I know, this is one of the most common problems in simple physics.

The condition here is m1 and m2 arenot equaland neither are r1 and r2.

Once given an initial velocity, can there be a condition in which the masses keep rotating (forever) about the axis? I don't want you guys to solve the problem, just give me the considerations I should take into account to solve it.

1 thing I found out was that the center of mass of the system needs to be above the axis of rotation at all times, right?

Thanks for any/all help offered. Have a great day. :)

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# This problem's been bothering me for a while now

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