Free body diagram的意思

"Free body diagram" is a term used in physics and engineering, particularly in the study of mechanics, to describe a simplified drawing that shows the forces acting on a body or object. The term "free" in this context means that the object is considered to be free from any constraints or supports, and the forces acting on it are shown as if it were isolated from the environment.

In a free body diagram, the object of interest is represented by a simple shape, such as a rectangle or a circle, and the forces acting on it are represented by arrows. The direction of the arrow indicates the direction of the force, and the length of the arrow is proportional to the magnitude of the force. The head of the arrow is placed at the point of application of the force, and the tail of the arrow is connected to the representation of the object.

Free body diagrams are used to analyze the forces acting on an object and to understand the net force acting on the object, which is the vector sum of all the individual forces. They are particularly useful in static and dynamics problems, such as those involving equilibrium, force systems, and motion analysis.