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Motion and Reference Points

Motion and Reference Points. Motion describes the change in an object's position. B. A. Motion and Reference Points. Motion can be either constant or varying. B. A. Motion and Reference Frames. Motion is always relative to a frame of reference.

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Motion and Reference Points

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  1. Motion and Reference Points Motion describes the change in an object's position. B A

  2. Motion and Reference Points Motion can be either constant or varying B A

  3. Motion and Reference Frames Motion is always relative to a frame of reference What is the frame of reference for this moving picture? Who is the observer?

  4. Choosing a Frame of Reference To someone riding on a speeding train, others on the train don’t seem to be moving. To an observer from outside the train, the people on the train are moving.

  5. Rest and Motion An object that is not moving with respect to a certain reference frame is said to be at rest with respect to that reference frame.

  6. Rest and Motion An object can be at rest with respect to one reference frame, yet moving with respect to another An object that is on the earth will appear at rest to someone on earth, but moving to someone who looks at earth from the outside

  7. Distance Distance measures the length of the path taken by an object.

  8. Distance • The length of the path taken is measured between two points B A

  9. The shortest distance between any two points is a straight line It is not always possible to make a straight line path Point B Point A

  10. Displacement • Displacement measures the change in position of an object

  11. Displacement • How far two points are from each other • The length from A to B along the shortest possible path B Distance Displacement A

  12. Magnitude and Direction • Vector—a line representing the amount and direction of a measurement Direction Magnitude Magnitude is the amount of length, speed, etc.

  13. Combining Displacements • Add the magnitudes of two displacement vectors that have the same direction. • Two displacement vectors with opposite directions are subtracted from each other.

  14. Overall displacement can equal zero Displacement is a change in position. If you start at a position and end at the exact same position, how much has your position changed?

  15. You Try Magnitude = 25 – 5 = 20 Direction = east because the resultant arrow would point eastward 5 25 What is the displacement of an object that moves 25 km east and then 5 km west?

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