Work, Power and Energy

Brief Summary of Work, Power and Energy with Question and Answers.

In our daily life work have many different meanings. Ex: Consider a person holding a weight at a distance 'h' off the floor as shown in figure. In every day usage, we might say that the man is doing a work, but in our scientific definition, no work is done by force acting on a stationary object. We could eliminate the effort of holding the weight by merely tying the string to some object and the weight could be supported with no help from us.

In our daily life, the term work refers to any kind of mental and physical activity. For example, Vinod is working in a factory. The machine is in working order, a Professor giving lecture in class and a police man regulating traffic are said to be doing work. But in scientific language, work has a different and definite meaning.