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The diagram that shows only the external forces acting on one body is called a:
APhase space chart
BFree-body diagram
CVector field map
DMotion graph plot
Answer & Solution
Correct answer: B. Free-body diagram
1. Solving a dynamics problem starts with isolating one object.
2. A free-body diagram represents the forces acting on that body.
3. Only external forces acting on the body are shown, because only those affect its motion.
4. Internal forces are deliberately left out because they cancel.
_Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 4 'Dynamics: Force and Newton's Laws of Motion', sections 4.1-4.8_
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