1. Advanced skiers turn by sliding the backs of their skisacross the snow. Since the fronts of their skis don’t move much,the skis end up pointed in a new direction.
a. The amount of sideways force that a skier must exert on theskis to slide them sideways is proportional to how hard the skispress down on the snow beneath them. Why?
b. Less skilled skiers sometimes turn without unweighting—theypush their skis sideways so hard that the skis slide anyway. Thistechnique is exhausting. Why does it require so much work?
c. Why is wax used on skis? Why wouldn’t WD-40 work as well asthe wax? What is in WD-40?
