- #1

anotherghost

- 12

- 0

I'm having trouble understanding a concept: say you've got a mass hanging from a peg by a string. Using conservation of energy, you can figure out what the minimum velocity is that the mass has to have initially so that it goes around the circle: at the top, mv^2/r = mg, so it just makes it around once. However, I'm having trouble with this - how do you calculate the minimum initial velocity so that it goes around the circle twice?

Confusion.