3 Motion ReviewPosition, 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 PositionDistance is how far an object travels from an initial position (xi) to a final position (xf).d represents distance.A reference point is an arbitrary point on an object, used to establish position.Distance Equation: d = xf-xi
6 Speed ReviewSpeed is the distance an object travels in a unit of time.Speed Equation: v = d/ t
7 Comparing SpeedsAverage 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 MotionDistance is the magnitude of the difference between initial position (xi) and a final position (xf).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 MotionThe Alaskan Iditarod’s race is broken into legs.