Linked from
The 17 pages that link to Free-body diagram, each with the reason it gives.
Newton's laws of motionRelated: It separates forces on one body before applying the laws.
ForceRelated: It makes the interacting forces explicit before calculating their net effect.
Newton's second lawRelated: It helps identify and sum the forces used in the law.
Equilibrium pointRelated: It makes the forces to be balanced explicit.
Newton's third lawRelated: Separate diagrams reveal that paired forces act on different bodies.
Static equilibriumRelated: It makes the force and torque balance equations explicit.
Static frictionRelated: It makes the direction and required magnitude of static friction explicit.
Contact forceRelated: It represents contact forces as arrows acting at interfaces.
Net forceRelated: It makes the forces to be summed explicit for a chosen object.
Resultant forceRelated: It isolates the forces that must be added to find the resultant.
Newtonian dynamicsRelated: It organizes the forces needed to apply Newton’s laws to a specific body.