In this case, place a squiggly line through the original vector to show that it is no longer in play-it has been replaced by its x- and y-components. Convert the free-body diagram into a more detailed diagram showing the x- and y-components of a given force (this is often helpful when solving a problem using Newton’s first or second law).We never include both forces of an action-reaction pair. However, forces that the object exerts on its environment must not be included. With the exception of gravity, all of the forces we have discussed require direct contact with the object. Do not include the net force on the object. Consider the types of forces described in Common Forces-normal force, friction, tension, and spring force-as well as weight and applied force. Include all forces that act on the object, representing these forces as vectors.We often place this point at the origin of an xy-coordinate system. If you are treating the object as a particle (no size or shape and no rotation), represent the object as a point. At first, you may want to draw a circle around the object of interest to be sure you focus on labeling the forces acting on the object. Draw the object under consideration it does not have to be artistic.Observe the following rules when constructing a free-body diagram:

Full body diagram physics