(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In a laboratory experiment two spherical balls are launched on a °at surface. Both are

uniform spheres of radius R and mass m. They are both given the same amount of

initial kinetic energy K0. However:

-ball A rolls without slipping

-ball B slides without rotating

What is the ratio Vb/Va?

2. Relevant equations

Moment of inertia of solid sphere= 2/5 (mr^2)

3. The attempt at a solution

for the rotating, I did

KErolling=1/2 mv^2 = 1/2 Iw^2 => KEo = 7/10 mv^2

then for the slipping, I'm having a bit of problem. I am not sure if i have to include the friction force or not. Without friction, it'd be F=ma, then KEo=ma, I'm not sure if i can substitute KEo as F or not..

Thanks

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# Homework Help: Rolling and sliding sphere on flat surface

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