21_free_body - Lesson 21: Free Body Diagrams Free Body...

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Lesson 21: Free Body Diagrams Free Body Diagrams We will need a way to organize forces that are acting on a particular object. The easiest way to do this is by using a free body diagram . A free body diagram is just a simple sketch of the object showing all the forces that are acting on it. To draw a proper free body diagram, you must follow these steps: 1. Draw a quick sketch of the object. Often a simple box will do. 2. Place a dot in the centre of the object. We basically treat this as the spot that all the forces are thought to act upon. 3. For every force acting on that object (we don't care about forces acting on any other objects), draw a vector that shows the size and direction of the force. Each vector must start from the dot and point outwards. 4. Label each vector based on the type of force it is. Do not include numbers or calculations! Example 1 : Sketch a free body diagram for a book being held up by a person. We draw a quick sketch of the book, and then put a dot in the centre. Next, we identify that there are two forces acting on this book; the force of
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21_free_body - Lesson 21: Free Body Diagrams Free Body...

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