Final answer:
Mechanics use a length of pipe over the wrench handle to loosen a rusty nut. This technique provides increased leverage and torque for easier turning. However, it can be hazardous if excessive force is applied.
Step-by-step explanation:
When trying to loosen a rusty nut with a wrench, mechanics sometimes use a length of pipe over the wrench handle. This technique helps in two main ways:
- Increased leverage: By placing a longer pipe over the handle, the mechanic can apply a greater force to the nut. This effectively increases the leverage and makes it easier to turn the nut.
- Increased torque: The longer pipe allows the mechanic to exert a larger torque on the nut. Torque is the rotational equivalent of force, and a greater torque can help break loose the rust and loosen the nut.
However, it is important to note that using a length of pipe can be hazardous. If excessive force is applied, it can break the bolt or cause other damage to the tool or equipment.