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    Basic concepts Basic concepts Presentation Transcript

    • Point of reference• Observational point tied to the motion of an observer.• In Newtonian physics, all motion must be defined in terms of a point of reference.• Relative Motion
    • Point of reference• Is the speed of the ball different relative to the pitcher, the truck driver, and the jet pilot? Why or why not?
    • Point of reference• Trajectory: The path of a moving body.
    • Distance• Distance is the measurement from one point to another. The length of the trajectory• Distance may refer to a physical length, a period of time, or an estimation.
    • Displacement• Displacement ( x) – difference between an object’s final position and its starting position. – Does depend on direction.• Displacement = final position – initial position• x = xfinal – xinitial• In order to define displacement, we need directions.• Examples of directions: – + and – – N, S, E, W – Angles
    • Displacement vs. Distance• Example of distance: – The ant walked 3 cm.• Example of displacement: – The ant walked 3 cm EAST.• An object’s distance traveled and its displacement aren’t always the same!
    • Displacement vs. Distance• An athlete runs around a track that is 100 meters long three times, then stops. – What is the athlete’s distance and displacement? • Distance = 300 m • Displacement = 0 m • Why?
    • Displacement and distanceTo go to school from home... your home Size = length of this arrow your displacement from school home to school A displacement has size & direction.
    • Displacement and distanceTo go to school from home... your home l2 l1 l3 your school Distance = length of path you travelled = l1 + l2 + l3 ( size of displacement)