Work is defined as the integral of the force over a distance of displacement. Work refers to an activity in which one exerts strength or faculties to do or perform something. In science, work is said to be done on an object when you transfer energy to that object. The SI unit of work is Joule (J). Here joule is defined as the work done by a force of one newton acting over a distance of one metre. Work is denoted by the symbol 'W'. In short, work is the amount of energy transferred by a force. Work calculator physics is also known as joules calculator.