# Ball on Slide

1. Oct 26, 2009

### CaptFormal

1. The problem statement, all variables and given/known data

A toddler is having fun rolling a ball down a slide of height h=4 m. The ball can be considered as a thin spherical shell, Icm=(2/3)mr^2, with m being its mass and r being its radius. What is the velocity of the ball at the bottom of the slide?

2. Relevant equations

KE(i) + PE(i) + Iw(i) = KE(f) + PE (f) + Iw(f)

KE(i) = Initial Kinetic Energy
PE(i) = Initial Potential Energy
Iw(i) = Initial Inertia*Omega

KE(f) = Final Kinetic Energy
PE(f) = Final Potential Energy
Iw(f) = Final Inertia*Omega

3. The attempt at a solution

I think I am supposed to use the above equation but I am not quite sure. Any suggestions? Thanks.

Last edited by a moderator: Apr 24, 2017
2. Oct 26, 2009

### ehild

You want to use conservation of mechanical energy, don't you? But Iw is not energy. It is angular momentum.

ehild

3. Oct 26, 2009

### CaptFormal

So, what do I do with this value: Icm=(2/3)mr^2? I am sure that it plays a part in solving for the solution.