Torque

 

                    Torque is a force that tends to rotate or turn things. You generate a torque whenever, you apply a force to turn handle of diesel engine.

Torque = Force ´ Distance from the center. 

Unit of Torque = N ´ m = Nm. 

It is common experience, that a nut which is hard to move by hand can be easily rotated when a spanner of longer length is used. Increasing length of application of force from the center of shaft increases torque applied.