A motion diagram shows the position of an object at successive times. In the particle model the object in the motion diagram is replaced by a series of single points. A time interval is the difference between two times. A vector drawn from the origin of the coordinate system to the object indicates the object’s position. Change in position is displacement, which has both magnitude and direction. The length of the displacement vector represents how far the object was displaced, and the vector points in the direction of the displacement. Position-time graphs can be used to find the velocity and position of an object, as well as where and when two objects meet. Any motion can described using words, motion diagrams, data tables, and graphs. The slope of an object’s position-time graph is the average velocity of the object’s motion. The average speed is the absolute value of the average velocity. An object’s velocity is how fast it is moving and in what direction it is moving.
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