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11.1 Notes

11.1 Notes. Motion. Frame of Reference. a) A system of objects that are not moving with respect to one another. B) Relative Motion a) Movement in relation to a frame of reference. Relative Motion. i) Ex. People on a train vs. people watching the train go by

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11.1 Notes

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  1. 11.1 Notes Motion

  2. Frame of Reference a) A system of objects that are not moving with respect to one another. B) Relative Motion a) Movement in relation to a frame of reference.

  3. Relative Motion i) Ex. People on a train vs. people watching the train go by - When the people on the train look at one another they do not seem to be moving, but to people watching the train go by they are moving very quickly.

  4. Relative Motion ii) ex. Objects inside the train vs. objects outside the train -When sitting on a train you can tell you are moving very quickly by watching stationary objects outside, but when walking down the train isle way you must look at a stationary object in the train to tell how fast you are going.

  5. Measuring Distance C) Measuring Distance a) The SI unit for measuring distance is the meter. b) For large distances it is useful to use the kilometer. (1km = 1000m) c) For small distances it is useful to use centimeters. (100cm = 1 m)

  6. Distance & Displacement D) Distance a) The length of a path between two points. E) Displacement a) The direction from the starting point and the length of a straight line from the starting point to the ending point.

  7. Vectors F) Vector a) A quantity that has magnitude and direction. b) The magnitude can be size, length, or amount. c) Vector addition is the combining of two vectors.

  8. Displacement G) Displacement along a straight line. a) When two displacements, represented by two vectors, have the same direction, you can add their magnitudes. b) For displacements in the same direction we can add their magnitudes. c) For displacements in the opposite direction we subtract their displacements.

  9. Displacement H) Displacement that is not along a straight path. a) When two or more displacement vectors have different directions. b) If you add the distance of each vector you get the total distance.

  10. Displacement c) If you add the distance between the starting point and the ending point you get the resultant vector. d) The resultant vector is the vector sum of two or more vectors. e) This is also the displacement.

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