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versatilehong
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Homework Statement
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?
Homework Equations
Moment of inertia of solid sphere= 2/5 (mr^2)
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