- #1
phantomvommand
- 271
- 39
- Homework Statement
- A ball rolls down a sphere (without slipping). At what height will the ball lose contact with the sphere?
Ball radius = r, sphere radius = R, ball mass = m, ball I = 2/5mr^2
- Relevant Equations
- Conservation of energy:
mg(R+r)(1-cos theta) = 1/2mv^2 + 1/2 I w^2.
My question is this:
- Friction exists (for no slipping/pure rolling to occur)
- Why is the work done against friction not accounted for in the conservation of energy equation?
Thank you!
- Friction exists (for no slipping/pure rolling to occur)
- Why is the work done against friction not accounted for in the conservation of energy equation?
Thank you!