Imagine that you are carrying a bunch of books and have to take them to a room on one floor above the floor you are on.

For this you may choose to use one of two ramps. The first one is very sloping, and the other has a gentle slope.

Which ramp would you choose? Well, if you wanted to make the least effort, you probably would have no doubt choosing the soft one. Inclined planes make weightlifting much easier. The lower the slope, the lower the force.

# The concept of work

Imagine you are lifting a book or pushing a table or a stroller. In all these activities you are doing work. She also does work when she produces a text, answers the phone, or does the lunch dishes.

However, the concept of Work in Physics is slightly different from the concept we assign to this word in our daily lives. In physics, it is said that **work was done when a force was used to displace a body.** In this case, the work is proportional to the force that displaces the body and the displacement produced by it, that is, **the greater the strength, the greater the work**, and **the higher the displacement, the greater the work**.

The concept of work in physics was created in the middle of the Industrial Revolution, when humanity began the production of more complex machines, which allowed the industrial development of some nations of the planet.

Therefore, if the force acts in the direction and direction of displacement, we can mathematically define the concept of Work, whose symbol is** t**, reads: **ok**.

In this mathematical expression, **F** is the strength and **d** is the displacement.

The unit of work in the International System is the **N.m**, which we call **Joule (J).**

This definition only applies when the force acts in the direction and direction of displacement and has its constant value. For example, when we press a body against a table, we are pushing, but that force does nothing to displace the body. Therefore, it does not do Work.

For example, to push a table by half a meter, making a force of 10N parallel to the table, we do a Work that can be calculated like this:

The work of a parallel force in the direction of displacement is the product of the force by this displacement.

## The work of force weight

The work of force weight is the value of weight multiplied by the change in height and elevation of a body.

Where: **P** is the weight of the body;

** m** it is the mass of the body;

** g** is the acceleration of local gravity;

** H** It is the variation in height that the body has suffered.