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

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Presentation on theme: "Motion Review 8th Grade Force and Motion Investigations 1-4 Summary."— Presentation transcript:

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

2 Motion Review

3  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.

4 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

5 Air Trolleys -Initial position vs. final position

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

7 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.

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

9 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)

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


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