Final answer:
Worn or bald tires can cause hydroplaning on wet roads, where a layer of water builds up between the tire and the road, causing the tire to lose contact and traction. Increased friction is desirable in situations where you need to stop quickly.
Step-by-step explanation:
Worn or bald tires can increase your stopping distance, make turning more difficult, and can cause hydroplaning at lower speeds when the road is wet. Hydroplaning occurs when a layer of water builds up between the tire and the road, causing the tire to lose contact and traction.
Increased friction is desirable in certain situations, such as when you need to stop quickly. For example, when you step on the brakes of a car, the brake pads create friction with the brake rotors, which helps to slow down or stop the car.