5. Why are skis not flat? Describe how the bend (camber) in a ski affects how it works. (2)

Skis are not flat because a flat ski would distribute the skier's weight evenly along the entire length of the ski. This would make turning difficult and unstable, especially at higher speeds. The ski would essentially behave like a very long, unwieldy sled.<br /><br />The bend in a ski, called camber, concentrates the skier's weight at two points near the tip and tail when the ski is unweighted. When the skier stands on the skis and applies pressure, the camber flattens out. This distributes the pressure more evenly along the ski's edge, allowing for better grip and control on the snow. The curved shape also helps the ski to carve a smooth arc when turning, rather than skidding sideways. Furthermore, the camber acts like a spring, storing energy when flexed and releasing it as the ski returns to its original shape, contributing to a more dynamic and responsive feel.<br />