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Motion

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Motion The process of changing position.

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Distance The total length of your path.

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**Displacement In a straight line.**

The distance between your starting position and your final position. In a straight line.

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Displacement = 9 m B 9 m A 5 m 4 m 6 m Distance = 15 m

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Speed The rate at which an object moves.

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Average Speed The distance an object moves divided by the time it took to move that distance.

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Instantaneous Speed An object’s speed at one instant.

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Constant Speed Speed that does not change.

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Velocity The speed AND DIRECTION of an object’s motion.

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Acceleration When an object’s speed or velocity changes, the object is accelerating.

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**Positive Acceleration**

When an object is speeding up.

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**Negative Acceleration**

When an object is slowing down.

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1 Lesson 1: Physics 150 / 215 Describing Motion Basic Terms & Units of measurement –distance & displacement –speed & velocity –acceleration Analyzing Motion.

1 Lesson 1: Physics 150 / 215 Describing Motion Basic Terms & Units of measurement –distance & displacement –speed & velocity –acceleration Analyzing Motion.

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