Final answer:
Torque, the rotational equivalent of force, is measured in newtons times meters (N.m). It quantifies the effectiveness of a force in causing rotation and is calculated with the formula t = rF sin ϴ.
Step-by-step explanation:
The unit of measure used to describe the torque needed to tighten a large object is newtons times meters, typically noted as N.m. Torque is the rotational equivalent of force, and it quantifies how effectively a force can cause an object to rotate. The equation for torque is t = rF sin ϴ, where 'r' represents the distance from the pivot point to the point where the force is applied, 'F' is the magnitude of the force applied, and 'ϴ' is the angle between the force vector and the lever arm. A greater lever arm distance will result in a larger torque for the same amount of force applied.