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Motion in One Dimension Mr. Dunk Pre-AP Physics Pearland High School

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Motion in One Dimension motion takes place over time and depends upon the frame of reference frame of reference – a coordinate system for specifying the precise location of objects in space; only worry about those objects directly related to what you are observing or measuring

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Motion in One Dimension displacement – the change in position of an object; straight line distance from the beginning of the motion to the end of the motion; represents a change of position; vector quantity (has magnitude and direction) Δx = x f – x i Δx = displacement x f = final position x i = initial position

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Motion in One Dimension displacement is not always equal to the distance traveled displacement can be positive or negative since it is a vector quantity; the + and – denote the direction of the displacement

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Positive and Negative Displacements

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Motion in One Dimension

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velocity ≠ speed; speed is a scalar quantity only; velocity is speed in a certain direction (a vector quantity) if you graph position vs time, the slope of your line gives you the velocity instantaneous velocity – velocity at some specific instant or at a specific point in an object’s path

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Graphical Interpretation of Velocity

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Motion in One Dimension

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Constant Acceleration and Average Velocity

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Motion in One Dimension Velocity and Acceleration vivi aMotion ++ speeding up -- +- slowing down -+ - or +0 constant velocity 0- or + speeding up from rest 00 remaining at rest

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Motion in One Dimension

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Air Resistance and Free Fall Acceleration If an object falls through the air, it reaches a point where the air resistance slows the acceleration of the object This does not mean that the object stops moving; the object stops accelerating; called terminal velocity Example of free fall acceleration with air resistance

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One Dimensional Motion

One Dimensional Motion

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