# Lagrange constraint mechanics problem

by DylanG
Tags: constraint, lagrange, mechanics
 HW Helper P: 2,155 $\theta$ is the angular position of an identified point on the smaller sphere, measured with respect to the line joining the centers of the two spheres, right? Note that not only does $\theta$ change with time, but so does the orientation of that joining line, so you need to take that into account as well. That's where the $$\dot\phi$$ comes from.