Discuss the changes in potential energy and kinetic energy and total energy for skateboarder going up and down on a half pipe ramp

In regards to basic motion, the total energy is simply the sum of potential energy and kinetic energy. Potential energy is dependent with position.

Going up:

Potential energy increases, Kinetic energy decreases, Total energy is constant

Going down:

Potential energy decreases, Kinetic energy increases, Total energy is constant