Re: Rolling AP Problem

[herbgottlieb@juno.com (Herbert H. Gottlieb)]

) Ron Curtin <curtin@oven.ccds.charlotte.nc.us> writes:
> Some students and I in my AP C-level high school course are trying a
> problem from the 1994 mechanics test.  A ball, rolling along a level
> surface, encounters an incline.  In the first case, we have no trouble
> calculating the velocity of the ball at the top of the incline.  Then, 
> the >question asks how fast the ball would be going if the incline was
> frictionless.  Would it be faster, slower, or the same speed as if it 
> did pure rolling up the incline in the first part of the problem? 
Thanks. 
>
Try solving this problem from an energy point of view. As the ball rises 
along the incline, there is a loss of kinetic energy that is equal to
a gain of gravitational potential energy AND a gain of  of heat energy
due to friction.

Herb Gottlieb from New York City
(Where rolling balls roll slower when they lose kinetic energy)

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