People often find joy in racing down a mountain on two thin sticks. This requires some physics. One to go fast you need to reduce the air resistance, to do this one must crouch down so you are more aerodynamic. Then without gravity you would not be able to speed down the hill, or stay on the mountain for that matter. Lastly for the ski lift to pull you up the mountain there needs to be a large amount of force pulling you up along with the heavy metal chairs and the lot of other people.