Application of Newton's Laws
Free-Body Diagram Summary
A free-body diagram isolates a body and illustrates all the forces that act on the body
so that a complete and accurate account of all of those forces may be considered.
Four steps must be performed to construct a free-body diagram:
Determine the body or combination of bodies to be isolated.
Isolate the body or combination of bodies with a diagram that represents the
complete external boundaries.
Represent all forces that act on the isolated body in their proper positions
within the diagram.
Indicate the choice of coordinate axes directly on the diagram.
The concept of the free-body diagram is summarized below.