Job It is a notion with multiple meanings. In this case, we are interested in its meaning linked to product of a force . Mechanical , for its part, is a term that is related to the branch of physics that focuses on the movement and balance of objects that are subject to the influence of a force.
Is called mechanical work to the one developed by a force when it achieves modify the state of motion That has an object. Mechanical work is therefore equivalent to energy needed to move the object in question .
In this context, mechanical work can be understood as a physical magnitude of scalar type, which is expressed by the unit of energy known as July . Whenever a force is applied on a body and it displaces it, it performs a mechanical work that can be measured in joules.
When mechanical work (which is symbolized with a letter W , for the English term "Work") is expressed through an equation, it is mentioned that W is equal to the force that is applied by the distance That is covered. This is because mechanical work assumes that force is applied in a certain trajectory.
A simple example of mechanical work is found when a worker pushes a wheelbarrow loaded with bricks from a sector of a work under construction towards another. The person applies a force to move the truck: therefore, it performs a mechanical job. The application of said force is maintained until the man stops pushing the truck; Once it stops pushing (that is, developing mechanical work), the truck stops.
It is important that we also know that the work at hand, if we consider both what is the displacement that it undertakes and the force and angle that it generates, can be classified into several types:
-Negative or resistant work, which would be, for example, that of the friction force and that is expressed by W0. A clear example of this type is the work that comes from an ox that pulls a plow.
-Null work, which could be done by anyone, in terms of strength and weight, when traveling in your car. It is expressed as follows: W = 0.
When talking about mechanical work, it is common that, in the same way, we choose to mention two other types of work that exist and are especially used in the field of Physics, in order to understand the world around us. We are referring specifically to these:
-Electrical work, which, as its name implies, refers to the set of charges and their movement inside a specific electric field.
-Thermodynamic work. This comes to mention what is the set of changes that some bodies undergo in terms of their volumes when they are subjected to different pressures or when they are subjected to different temperatures.