Final answer:
The choice between using chains or snow tires in densely packed snow depends on the conditions and laws. Chains offer superior grip on ice and snow, while snow tires provide better traction than regular tires and remain flexible in cold weather. More friction is also desirable in the design of athletic footwear for safety and performance.
Step-by-step explanation:
Whether to use chains or snow tires in densely packed snow depends on the severity of the conditions and the local laws. Chains are highly effective at providing traction on ice and densely packed snow, they essentially bite into the snow and ice, offering grip that snow tires cannot match. However, chains can be more difficult to install and may damage the road if used improperly. Snow tires, on the other hand, are made of a softer rubber compound that remains flexible in cold temperatures, providing better traction than standard tires. They also feature specialized tread patterns designed to expel snow and slush and maintain contact with the road.
When considering other circumstances where more friction is desirable, one example is in athletic footwear. Traction on the bottom of sports shoes allows athletes to stop, start, and change directions quickly without slipping, making friction essential for both performance and safety on the playing field.