PHYS 1600 Lecture Notes - Lecture 2: One Direction
18 Jan 2017
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Compare the time interval that passes as something goes through displacement. : vx, avg = ( x/ t) } average velocity. You can do the same with distance and get. : v, avg = d/ t } average speed. Note that: avg velocity is a vector quantity & avg speed is a scalar quantity; however, both have the same units m/s. You could reduce the time interval over which you measure the average to get a more accurate representation of the instantaneous velocity. Vx = lim ( x/ t) as t approaches zero. : this is equal to dx/dt } instantaneous velocity. Instantaneous speed is the magnitude of instantaneous velocity. A model is a set of conditions that occur often and are worthy of note. : i. e. a car traveling at constant speed on the. : if velocity is constant, the average velocity is the same as the instantaneous velocity.
