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Motion

Motion. Frame of Reference. A place or object used for comparison to determine if an object is in motion. Objects that we call stationary—such as a tree, a sign, or a building—make good reference points. Change in Motion.

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Motion

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  1. Motion

  2. Frame of Reference • A place or object used for comparison to determine if an object is in motion. • Objects that we call stationary—such as a tree, a sign, or a building—make good reference points.

  3. Change in Motion • An object is in motion if its distance from another object is changing. • Theory of Plate tectonics- Earth’s landmasses have changed position over time because they are part of plates that are slowly moving.

  4. Speed • The speed of an object is the distance the object travels per unit of time. • AVERAGE SPEED- The overall rate of speed at which an object moves; calculated by dividing the total distance (measured in meters) an object travels by the total time. • INSTANTANEOUS SPEED-The speed of an object at one instant of time. Speed= Distance /Time

  5. Velocity • Speed in a given direction • When you know both the speed and direction of an object’s motion, you know the velocity of the object. Velocity= distance/time

  6. Graphing Motion • You can show the motion of an object on a line graph in which you plot distance versus time. • The steepness of a line on a graph is called slope. Rise/run Distance Time Graph

  7. Acceleration • The rate at which velocity changes • In science, acceleration refers to increasing speed, decreasing speed, or changing direction. • To determine the acceleration of an object moving in a straight line, you must calculate the change in speed per unit of time.

  8. Acceleration Acceleration= final speed-initial speed/time • To increase acceleration you must decrease mass • An increase in mass would decrease acceleration

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