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Published byAraceli Peddicord Modified over 2 years ago

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Motion Review 8th Grade Force and Motion Investigations 1-4 Summary

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Motion Review

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Position, represented by the symbol x, is the location of an object at any given time. Motion is the act of changing position. The Greek letter delta ( ) represents the concept of change. x represents change of position.

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Distance and Position Distance is how far an object travels from an initial position (x i ) to a final position (x f ). d represents distance. A reference point is an arbitrary point on an object, used to establish position. Distance Equation: d = x f -x i

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Air Trolleys -Initial position vs. final position

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Speed Review Speed is the distance an object travels in a unit of time. Speed Equation: v = d/ t

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Comparing Speeds Average Speed: the total distance traveled by an object divided by the total time from start to finish. The slope of the line on a distance vs. time graph varies as speed changes; steeper slopes represent faster speeds.

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Comparing Speeds Graph Who is faster, Gaston or Bert? How do you know?

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Representing Motion Distance is the magnitude of the difference between initial position (x i ) and a final position (x f ). Displacement is the distance an object moves in a particular direction. Displacement can be positive or negative. Position graphs plot position vs. time; distance graphs plot distance vs. time. Complex motion events can be analyzed into coherent segments called legs. (ex: Iditarod)

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Representing Motion The Alaskan Iditarod’s race is broken into legs.

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