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Chapter 5: Problem 3

In cross-country skiing, skis should easily glide forward but should remain at rest when the skier pushes back against the snow. What frictional properties should the ski wax have to achieve this goal?

Short Answer

Expert verified
The ski wax should have frictional properties that make friction 'direction-dependent'. It should increase static friction when a skier pushes back, providing the skis a good grip with the snow, and decrease kinetic friction when the skis glide forward, allowing a smooth and longer slide.

Step by step solution

01

Understanding the basics

Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact. Ski wax is used to reduce this friction, allowing the skis to glide more smoothly.
02

Direction-wise friction

When a skier pushes back against the snow, friction should be high enough to prevent the skis from slipping backward. This provides the necessary grip between the ski and the snow. But when the skis glide forwards, the friction should be low. This allows the skis to travel a longer distance with lesser effort.
03

Frictional properties of ski wax

Ski wax needs to have properties that make friction 'direction-dependent'. More precisely, it should increase 'static' friction that prevents motion when a skier pushes back, and decrease 'kinetic' friction that opposes the sliding motion when the skis glide forward.

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