Chapter 1 Concepts of Motion.docx

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Motion is defined as the change of an object"s position with time. The path along which an object moves, which might be a straight line or might be curved, is called a trajectory. Transitional motion is the motion of an object along a trajectory. An object that can be represented as a mass at a single point in space is called a particle. A particle has no size, no shape and no distinction between top and bottom. The particle model of motion is a simplification in which we treat a moving object as if all of its mass were concentrated at a single point. An arrow drawn from the origin to an object"s position is called the position vector of the object and it is given the symbol r. A scalar quantity can be positive, negative or zero. A vector quantity can have a magnitude as well as a direction.

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