Final answer:
When changing a tire, the nuts should be turned counterclockwise to loosen them. This follows the basic principle that turning a nut clockwise tightens it, so doing the opposite will loosen it.
Step-by-step explanation:
When changing a tire, turning the nuts counterclockwise will loosen them. This is a basic principle of mechanics that applies to threaded fasteners, such as nuts and bolts. When you apply torque to a nut using a wrench, turning it counterclockwise reduces the engagement of the threads, allowing the nut to be removed from the bolt. Conversely, turning the nut clockwise will tighten it by increasing the engagement of the threads. Remember to secure the car safely on a flat surface with a jack before attempting to change the tire, ensuring your own safety and making the process of loosening and tightening the nuts more effective.
When changing a tire, turning the nuts counterclockwise will loosen them. A wrench provides grip and mechanical advantage in applying torque to turn a nut. Figure 2.31(a) shows that turning counterclockwise loosens the nut, while turning clockwise tightens it. By applying force in the opposite direction of the tightening motion, turning the nuts counterclockwise will cause the nut to loosen and eventually come off.