Dynamics observes the relationships between movements and the forces that cause them.
In dynamics, Newton's laws describe the effect of the forces (frictional, gravitational, centripetal) applied to a body. In the case of free-falling bodies, particular attention is paid to the gravitational force, which leads to the concept of gravitational acceleration.
Dynamics is the opposite of statics: dynamics studies bodies set in motion by forces, while statics is defined as the part of mechanics concerned with the balance of forces. Statics therefore implies that objects are immobile.
In addition, diagrams, i.e. a vector representation of forces, are used to explain mechanical systems, whether in equilibrium or not.