Final answer:
True, only under-inflated tires compromise optimal tire performance. Optimal tire pressure is crucial for vehicle safety, efficiency, and tire longevity. More friction is desirable in situations like winter driving or sports for better traction and safety.
Step-by-step explanation:
The statement "Only under-inflated tires compromise optimal tire performance" is true. Maintaining proper tire pressure is crucial for optimal tire performance and vehicle safety. According to physics, when you pump air into a tire, its volume first increases until the tire walls resist further expansion. At this point, any additional air causes an increase in pressure. This pressure is important because it helps the tire maintain its shape and provides a cushion between the car and the road for a smoother ride. It is essential to follow the manufacturer's specified optimal tire pressure for cold tires to ensure safety, efficiency, and longevity of the tires. Over-inflated tires can also be problematic, leading to a risk of tire burst and poor traction.
Regarding other situations where more friction is desirable, winter tires on icy roads create more friction for safer travel. An additional example would be athletic shoes designed with grippy soles to prevent slipping during sports activities, providing traction and improved performance.