Rotational motion energy

  • Thread starter kaspis245
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  • #1
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Homework Statement


Same mass sphere and cylinder are rolling on a horizontal plane. Which part of each objects kinetic energy does objects rotational energy make up?

Homework Equations


Erotational = 1/2 Iw2

Ekinetic = 1/2 mv2

The Attempt at a Solution


[/B]
I know, that moments of inertia are:

Icylinder = 1/2 MR2

Isphere = 2/5 MR2

And I know that:

Etotal = Ek + Erotational

What sould I do?

 
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Answers and Replies

  • #2
Doc Al
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What sould I do?
For rolling without slipping, how are ##\omega## and ##v## related?
 
  • #3
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Well, v = wR .
 
  • #4
Doc Al
Mentor
45,033
1,336
Well, v = wR .
Exactly. Use that to relate rotational and translational kinetic energy.
 

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