# Friction - Free Body Diagrams • What is a Free Body...

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Free Body Diagrams Outline • What is a Free Body Diagram •Demonstrat ions • Static Equilibrium • Unbalanced Forces

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Free Body Diagrams • This is where the physics gets done, the rest is just algebra and calculus • An important tool for understanding motion • The following steps will help you get it right every time
Identifying Forces Identifying forces Identify “the system” and “the environment.” The system is the object whose motion you wish to study; the environment is everything else. Draw a picture of the situation. Show the object—the system—and everything in the environment that touches the system. Ropes, springs, and surfaces are all parts of the environment. Draw a closed curve around the system. Only the object is inside the curve; everything else is outside. Locate every point on the boundary of this curve where the environment touches the system. These are the points where the environment exerts contact forces on the object. Name and label each contact force acting on the object. There is at least one force at each point of contact; there may be more than one. When necessary, use subscripts to distinguish forces of the same type. Name and label each long-range force acting on the object.

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Drawing FBDs Drawing a free-body diagram Draw a coordinate system. Use the axes defined in your pictorial representation. If those axes are tilted, for motion along an incline, then the axes of the free-body diagram should be similarly tilted. Represent the object as a dot at the origin of the coordinate axes.
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Friction - Free Body Diagrams • What is a Free Body...

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