Key Terms: Forces and Free Body Diagrams

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The resistance an object has to a change in its state of motion.

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An influence that can change the motion of an object. A push or pull that acts upon an object as a result of that objects interactions with its surroundings.

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A graphical illustration used to visualize the applied forces, moments, and resulting reactions on a body in a given condition.

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Force that resists the sliding or rolling of one solid object over another. Traction.

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A quantitative measurement of inertia, a fundamental property of all matter. It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force.

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Defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg.

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The vector sum of all the forces that act upon an object. It is the sum of all the forces.