Question

On a free-body diagram, you sketch

**A.** all of the forces exerted on all of the objects
in the diagram.

**B.** [It depends on the specific problem.]

**C.** all of the forces exerted on one object in the
diagram.

**D.** all of the forces that one object exerts on all
of the other objects in the diagram.

Answer #1

**Free**-**body diagrams** are
**diagrams** used to show the relative magnitude and
direction of all forces acting upon an object in a given
situation.

**A free-body diagram (or FBD) displays an object taken
in isolation with all the forces that act on that
object.**

Therefore the forces exerted by the object itself *are
not* included.

There is no hard and fast rule about the number of forces that
must be drawn in a free-body diagram. The only *rule* for
drawing free-body diagrams is to depict all the forces that exist
for that object in the given situation.

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