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A bowling ball that originally is not spinning is thrown down a bowling lane; by the time the ball strikes the pins it is rolling without slipping. Is the total mechanical energy con- served?
There are two kinds of surfaces in the bowling lane. One part is less frictional surface and another part is more frictional surface. First the bowling ball will slip with the less frictional surface, when it is thrown down a bowling lane. After sometime when the ball enters into the more frictional surface it will start to roll due to the external frictional force. So friction is acting on the system as an external force. Without any applied external force in an isolated system in which only conservative forces act, the total mechanical energy remains constant. Because the system is acted by an external force therefore the total mechanical energy of the system will not be conserved.
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