Question

State and define the S.I unit of work.

Answer 1

Hint: Here we know that the work done by any object is given by the product of force and the displacement. From the basic definition we can have the unit of work as Newton-meter. From this unit we can get the S.I unit of the work.

Complete step-by-step answer:
As we know that the S.I unit of work is joule is represented J. Joule is defined as the work done by a force of one Newton causing a displacement of one meter. Sometimes, Newton-meter (N-m) is also used for measuring work.

Additional Information: Work can be defined as the measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. Further, force experienced by a particle or an object can be defined as the product of mass m and the acceleration a. The S.I. unit of force is Newton and it is represented as N. The mass of an object is defined as both a property of a physical body and also a measure of its resistance to acceleration or a change in its state of motion, when a net force is applied.
Also it can be said that an object's mass also tells about the strength of its gravitational attraction to other bodies. The SI unit of mass is kilogram or it can be represented as kg.
Pressure applied on an object is defined as the force exerted on the object per unit area.

Note: Here, we should note down that the unit of work can also be given in kilo-Joule, electron volt. From the basic definition of work we can say that when the displacement is zero, which means there is no work done.