The Physics 241 Puzzler

In class we had a rolling race down an incline between several rings and several cylinders. The cylinders always won ... and neither the radius nor the mass had anything to do with it! Understanding moment of inertia, rotational kinetic energy, and conservation of energy is all that was required to argue why the cylinder always won.

Now consider a race up the incline. A hoop and a cylinder have exactly the same translational speed at the bottom of an incline. Although irrelevant, you may consider both to have identical radii and masses. Using arguments similar to those for the downhill race, predict which will roll the farthest up the incline. You may do the calculations if you wish, but you must defend your answer with WORDS!



Be sure to enter your full name. Enter your email address if you want the number of points awarded e-mailed back to you. Responses should be brief but complete. You must click the SUBMIT button to submit your entry. (You should receive a "Thank You" reply almost immediately.) Entries are due by noon on Monday of next week.
NOTE: Only your first submission will be accepted!

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