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Help with classical mechanics

  • Thread starter bigoxygen
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  • #1
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Hi!

My classical mechanics course is proving to be quite a challenge. The textbook has not arrived yet, and my professor has already assigned a problem set. For example, one question is

A bead of mass m is constrained to move along a smooth conical spiral. The radius of the spiral ρ = a z and the angle along the spiral φ = - b z where ρ, φ and z are the standard cylindrical coordinates. Find the equation of motion of the bead.

I have no idea where to start because we don't do any examples of worked problems in class, only theory and proofs. Does someone know any good online resources that I can check out?

Thanks
 

Answers and Replies

  • #2
MalleusScientiarum
Essentially you can find z as a function of time. The rest are constraints. Write down the Lagrangian in terms of rho, phi and z, then substitute where applicable.
 

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