Final answer:
To tighten a nut, a wrench is required, which provides the necessary grip and mechanical advantage. An alternative could be socket wrenches or a power drill. The concept of torque is essential for understanding the function of a wrench in applying force.
Step-by-step explanation:
To tighten a nut, the correct tool required is a wrench. This tool provides grip and mechanical advantage which enables the application of torque to turn the nut. When you turn the wrench clockwise, as referenced in option 3 of the given choices, the nut tightens. Socket wrenches or a power drill can also be efficient tools for this task, offering additional leverage or power respectively.
Mechanics may use a length of pipe over the handle of a wrench to remove a very tight bolt. This technique increases the lever arm, thereby increasing the torque applied to the bolt. However, it's important to note that this can be hazardous as it can potentially break the bolt due to the excess force.
The concept of torque is fundamental in understanding how a wrench works. Torque (₹) is the vector product of the distance R from the pivot (nut) to where the force F is applied (the end of the wrench handle) and the magnitude of the force. It can be calculated with the equation ₹ = R × F.