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Measuring Motion

Measuring Motion. Speed and Acceleration. Measuring Motion. Average Speed Distance traveled divided by the time it took to travel the entire distance. Measuring Motion. Instan taneous Speed Speed measured at an instan ce. e.g. the moment one looks at the speedometer.

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Measuring Motion

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  1. Measuring Motion Speed and Acceleration

  2. Measuring Motion Average Speed Distance traveled divided by the time it took to travel the entire distance.

  3. Measuring Motion Instantaneous Speed Speed measured at an instance. e.g. the moment one looks at the speedometer

  4. Measuring Motion Speed = Distance/ Time v = d/t The equation rearranged for Distance: d = v x t Time: t = d/v

  5. Note! Speed is a so called scalar quantity. It only has magnitude (numerical value). Velocity in comparison has magnitude AND direction. Velocity is a vector quantity. Speed and velocity are not the same. Velocity is speed plus direction.

  6. Measuring Motion Acceleration Rate of change of speed or change of direction of motion of an object over time. Acceleration = Change in Speed/Time interval

  7. Measuring Motion a = (v2- v1)/ (t2- t1) ( a = v/ t) a…. Acceleration v2…. Final speedV1… initial speed t 2… ending timet1….start time

  8. Measuring Motion

  9. Measuring Motion ????? Think! Is an object that is slowing down accelerating? Is an object that changes directionsaccelerating?

  10. Measuring Motion There are three cases of acceleration: Speeding up Slowing down Changing direction

  11. Acceleration a = v/t The equation can be rearranged for v = a x t And for t = v/a

  12. Recap • What is the difference between average and instantaneous speed? • When does an object accelerate?

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