To help visualize and solve problems involving forces, it is useful and often necessary to draw free-body diagrams.
Free-body diagrams are diagrams in which the forces acting on an object in a given situation are drawn on the object, free of its surroundings.
Points to remember when drawing a free-body diagram:
As you are sitting on a chair, there are two forces acting on you. There is the force of gravity acting downward and the force of the chair upward on you, e.g., the normal force. These forces are shown acting on the lady sitting on a chair below. The free-body diagram (FBD) is shown to the right.
Draw free-body diagrams for the red book in each of the following situations. Check your answers by holding your mouse over the image to see the correct FBD.
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