not sure how to use Conservation laws to solve this problem (Lagrangian mechanics)

[James1991]

Nevermind I've done it now

[diazona]

Try starting with part (a). If you're having trouble with it, post your work and let us know exactly what's confusing you.

[James1991]

Try starting with part (a). If you're having trouble with it, post your work and let us know exactly what's confusing you.

I've been trying for a while now. I don't know how to relate \phi with the distance rolled down the plane. Could really use some help if you know anything that would help. Thanks

[diazona]

If the cylinder rotates by an angle \phi, how much does the outer edge of the cylinder move?

[James1991]

If the cylinder rotates by an angle \phi, how much does the outer edge of the cylinder move?

\phi = \phi(0) + w(0)*t +(1/2 alpha*time-squared)?

[diazona]

No. I'm asking for a linear distance (something you would measure in meters).

[James1991]

No. I'm asking for a linear distance (something you would measure in meters).

oh sorry, s = r\phi

[diazona]

Yep, that's it. Now how does that distance s relate to the distance the cylinder rolled along the surface?