In order to understand how kinetic and potential energy works in an ski lift it is necessary to know its terms
Potential energy is the energy that a body located from its height above the ground has
Kinetic energy is the energy of a body that is in motion
for the ski lift:
Kinetic Energy: When the ski lift moves from floor to floor
Potential Energy: When the ski lift is standing on the floor and people enter.
Gravitational energy: the chairlift uses the force of gravity to lower and change from potential energy to kinetic energy, with its own weight
I hope its help you