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        9-12

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        Kinematics

        This overhead view of an animated car illustrates its velocity and acceleration as it starts up, moves in a straight line, and turns. Velocity is one way we describe motion, and includes the notions of both speed and direction: going fast versus going slow, going east versus going north. Velocity is how position changes with time. Acceleration is how we describe the changes in velocity over time: speeding up, slowing down and changing direction are all examples of when acceleration occurs.

        Learn more at Animations for Physics and Astronomy.

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