For what purpose are simple mechanisms used?

Basically, simple mechanisms are used in order to obtain a gain in strength, i.e. to increase the force acting on the body several times.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.