Work is the transfer of energy to an object through the application of a force along with a displacement. This is a fundamental concept in physics and is expressed in joules, ergs, and foot-pounds.
The word work is derived from the Greek root
When a person is healthy and physically and mentally ready to work, it is usually because they have found a purpose in life or a reason to be active. It may be their career, a family, or something in the community. This can be important in providing a sense of economic self-sufficiency, social interchange, and a feeling of self-esteem and identity.
It can also be useful in solving problems by calculating and reasoning, as with the study of maths. For example, to solve the problem of how to raise a beam from ground level to a height, it is necessary to work out the motion of the beam and determine where it will end up.
There are two types of work: positive and negative. A positive type of work is characterized by the fact that the force and the displacement are in the same direction; in other words, they are parallel to each other. Examples of positive work include the fall of a ball towards the earth, and the movement of an object with a weight.
A negative type of work is characterized by the fact the force and displacement are in opposite directions; for example, the movement of an object from the surface of a mountain to the ground is a negative type of work. When a person is lifting weights, the work done is positive because the body moves in the direction of the weight.
This can be difficult to understand if you don’t have an understanding of the physical sciences, especially when dealing with vectors and force. Fortunately, there is a great deal of knowledge available on the subject and a lot of it can be learned.
The most common unit of work is the joule. It is equal to the amount of energy required to push a body in the direction of a force of 1 N. Other units of work are the calorie, the foot pound, and the erg. The erg is a gaussian unit, and 10,000,000 erg is the equivalent of 1 joule.