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# Free-body diagrams

A free-body diagram is a diagram showing all of the forces acting on a single object.

Free-body diagrams are useful in determining if the forces on an object are balanced.

The object is drawn as a rectangle and each force is represented by an arrow in the direction of the force.

Each arrow must be labelled with the symbol of the force (e.g. $F_{1}$, $N$, $W$).

The magnitude of each force can be indicated by the length of the arrow. However, this is only true if stated in the description of the diagram.

A free-body diagram of an object sliding down a slope.