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Unformatted text preview: unchanged. Therefore, you can change an objects momentum without changing its kinetic energy. On the other hand, when you change the objects kinetic energy, you must change its speed. Because the magnitude of its momentum depends on the speed, you must therefore also change the momentum. Exercise 10. This is an application of the work-energy theorem. Remember that friction does negative work and decreases the kinetic energy. net f i W F x KE KE KE = = =-( 29 ( 29 12 J 0.6 N 5 m 9 J f i i KE KE W KE fd = + =-=-=...
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- Fall '02