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Section 9-1. Describing Motion. Recognizing Motion. An object is in motion if the distance relative to another object is changing This is dependent on your point of view (Theory of Relativity) Reference point is a place to tell if you are moving
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Section 9-1 Describing Motion
Recognizing Motion • An object is in motion if the distance relative to another object is changing • This is dependent on your point of view (Theory of Relativity) • Reference point is a place to tell if you are moving • (+) and (-) signs are used to indicate direction
Distance and Displacement • Distance is the length between two points • Four kilometers from Marsh Jr. to Bidwell Jr. • Displacement is length and direction • Bidwell Jr. is two kilometers north from Marsh Jr. • Vectors are used to show displacement
Displacement (vector) Distance (not a vector)