Final answer:
Mechanics sometimes use a breaker bar, which is a pipe placed over the handle of a wrench, to remove tight bolts. The pipe provides extra leverage, allowing more torque to be applied and making it easier to loosen the bolt. However, caution must be exercised to avoid breaking or stripping the bolt.
Step-by-step explanation:
Mechanics sometimes put a length of pipe over the handle of a wrench when trying to remove a very tight bolt. This technique is known as using a 'breaker bar'. The pipe provides extra leverage, allowing the mechanic to apply more torque to the bolt. By increasing the torque, the resistance encountered by the bolt is overcome, making it easier to loosen.
However, it is important to exercise caution when using a breaker bar, as excessive force can cause the bolt to break or strip the threads. Therefore, it is crucial to use the breaker bar judiciously, ensuring that only the necessary amount of force is applied to loosen the bolt without causing damage.