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It explains the purpose of isolating a single body and representing only the forces acting on it, using directed vector arrows and appropriate labels. The activity covers when coordinate axes should be added for Newton’s second law in component form and how object orientation affects force drawing. 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You will learn the properties of a correct free-body diagram, and you will learn how to distinguish between correct and incorrect free-body diagrams.  \nPrior Experience / Knowledge Needed  \nYou should be familiar with vectors. You should know that force is a vector quantity. You should be able to identify the forces acting on a particular object. You should know the common forces used to describe and analyze large-scale objects.  \nFREE-BODY DIAGRAMS  \nAs a first step in learning about free-body diagrams, you must distinguish them from a host of other drawings employed in many books in which forces (sometimes on more than one body), positions, and velocities are all indicated on a single drawing. In contrast, a free-body diagram shows all the forces acting on a single, isolated body. Only forces should be entered on a free-body diagram. The idea behind a free-body diagram is that, as Newton’s laws describe, the motion of an object is completely determined by the forces exerted on the object. In essence, we replace each agent interacting with the object by the force it exerts on the object. This is why the body must be isolated (a “free”body) . Indicating all of the forces acting on a single body makes it possible to discuss and determine the behavior of that body without referring to any of the objects exerting the forces.  \nMinds•On Physics  \n209  \n© 1999 Kendall/Hunt Publishing Company  \nWhen drawing a free-body diagram it is customary to draw a point to represent the body. This point should be drawn away from any other illustration or diagram. In a free-body diagram the object is drawn as a point because Newton’s laws are valid only for point objects. On this drawing, show each force exerted on the body as a directed line segment with the tail end of the vector starting at the point. The direction of the arrow should bein the same direction as the force. Whenever possible the length of the vector should be drawn to be roughly proportional to the size of the force. Each force in the diagram should be clearly labeled and distinguishable from all the other forces present in the physical situation.  \nWhen the diagram is to be used to help write the dynamical law, F net = ma in component form, a set of axes, indicating the component directions, should be drawn on the free-body diagram. These axes can be placed anywhere on the diagram but are often placed with the origin located at the point representing the center of the object. Also, these axes can be oriented in any way. Usually, the orientation is chosen to make it easier or more convenient to find components of the forces.  \nSometimes, for illustration purposes, the object is drawn as having spatial extent, such as a block or square, with all the forces drawn from a point at the center of the body. When drawing the object it is important to preserve the object’s orientation.  \nSome valid free-body diagrams are shown below. Note that: (1) only forces appear in the diagrams (and the net force should never appear); (2) a coordinate system may be shown; and (3) whether or not the body is represented for illustration, all forces begin ata point.  \nSome valid free-body diagrams  \n210  \nActivity 50  \nRecognizing and Interpreting Free-Body Diagrams  \nExplanation of Activity and Examples  \nThere are two parts to this activity. In the first part, you will see if you can distinguish between valid and invalid free-body diagrams that are given to you. Then in the second part you will label given free-body diagrams with the appropriate symbols to represent the forces acting on particular objects.  \nPART A: Recognizing Valid Free-Body Diagrams  \nPresented below are descriptions of physical situations together with a diagram. For each case,(a) state whether or not the diagram is a valid free-body diagram. (b) If the di","cbCaicS5ZU2gL37I","https://ap.wps.com/l/cbCaicS5ZU2gL37I","pdf",162382,"English","# Purpose and Expected Outcome\n# Prior Experience / Knowledge Needed\n# Free-Body Diagrams\n# Activity 50\n## PART A: Recognizing Valid Free-Body Diagrams\n## PART B: Interpreting Free-Body Diagrams","[{\"question\":\"What is the main purpose of a free-body diagram in this activity?\",\"answer\":\"The activity teaches what a free-body diagram is and how to use it to determine an object’s behavior based on the forces acting on that isolated body.\"},{\"question\":\"What makes a free-body diagram invalid?\",\"answer\":\"A free-body diagram is invalid if it shows non-force information such as velocity, positions, or other agents’ effects; only forces should appear, and the net force should not be shown.\"},{\"question\":\"How should forces and directions be represented in the diagram?\",\"answer\":\"Each force should be drawn as a directed line segment (vector) with the tail at the body’s point, the arrow direction matching the force direction, and the vector length roughly proportional to the force size.\"}]","Recognizing and Interpreting Free-Body Diagrams - Activity 50 | PDF",1792991002,15]