There's a ton of physics in snowboarding! There's some friction, which you don't want a lot of that way you can go faster, and a bunch of other cool stuff like power, work, and energy. You can figure out how much work you do going down a mountain by multiplying the distance of the slope by the amount of force used. You can also find out your power by using the work and dividing that by the amount of time it took you to get down the mountain. You can also figure out the amount of energy it took you... pretty cool stuff.