Thoughts about using Lagrange multipliers to find constraint forces

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@DotPhysics had a great video yesterday talking about whether an ice block would fall away from a parabolic hill. He used Lagrange multipliers to really investigate that. Here I talk about ways that I have found the Lagrange multipliers to be useful and when I find that they don't provide the easiest access to the constraint forces.

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Nice. Whenever I made a Lagrangian video, in the back of my mind I'm thinking---I wonder what video Andy will make based on this.

rhettallain