Barbarian chuckles:
Of course. How else would it be dispersed? If it wasn't dispersed, it would roll back and forth indefinitely.
Well, let's see if we can help you with it...
A moving ball has kinetic energy. Going down the hill, it gains kinetic energy, losing potential energy. At the bottom of the hill, it has a maximum of kinetic energy and zero potential energy. As it goes up the hill, it gains potential energy and loses kinetic energy. When it gets to a point somewhat lower than the point at which it started, it will stop and then begin to roll downhill the other way. And it will go back and forth, in lower and lower runs as more and more of the energy is dispersed as heat from friction. Eventially, all of the energy will be lost, and the ball will come to a halt at the bottom of the hill.
Since it's at the bottom of the hill, it has no potential energy and since it's not moving, it has no kinetic energy. Where did it all disperse? In the form of heat.
Now, if there was no friction from air resistance or rolling friction, there would be no dispersion of energy as heat, and the ball would oscillate back and forth indefinitely.
What has you confused, Stipe, is the fact that kinetic energy is not dispersed (other than by friction into heat), but is transformed into a different form of energy, potential energy.
If you'll watch closely, you'll see that he doesn't just "drop", Stipe. He "pumps" when he hits the bottom of the pipe, to add energy to the board. This increases the kinetic energy and allows him to go higher than he would than if he merely rolled like a ball down a hill:
So, up the hill, most of the kinetic energy has been transformed to potential energy. The remaining energy is lost as heat from friction, when he dismounts and he lands on the deck,and comes to a halt.
Stipe, being unaware of the physics involved, exclaims: "Oh, his energy didn't disperse! He's going to have to keep rolling back and forth forever!"
Stupid, stupid Stipe. :chuckle: