Final answer:
Tires are rotated to promote even wear. Additional friction is desired for better vehicle control on icy roads and athlete safety in sports like basketball. The number of revolutions a tire makes can be calculated by dividing the traveled distance by the tire's circumference.
Step-by-step explanation:
Tires are rotated to promote even wear. This maintenance practice ensures that the tires wear down uniformly, maintaining balance and stability in the vehicle's performance over time. Tire rotation is essential for many reasons, including preserving the tire's lifespan and vehicle safety.
When you drive over icy roads, using tires specifically designed for winter conditions provides more friction. This additional friction is critical to ensure better grip and control of the vehicle, reducing the likelihood of slipping and accidents. Another example where more friction is desirable would be in sports like basketball, where athletes need shoes with good grip to prevent slipping on the court while running and jumping.
Calculating the number of revolutions a tire makes before wearing out involves figuring out the circumference of the tire and then determining how many times it turns over a particular distance. Using the radius of 0.260 m and the distance of 80,000 km (80,000,000 m), the calculation would involve dividing the total distance traveled by the circumference of the tire to find the number of revolutions.