Lecture #4 Velocity vs. acceleration Graphing More Worksheet #1
Get your iClickers ready
Quiz3.1 In the following situations, when are the average speed and the magnitude of the average velocity very different, i.e. not even approximately equal? A. A sprinter running 100 m from start to finish. B. A swimmer crossing a river in a straight line even though there is a substantial current. C. A 400 m runner completing a lap at a very steady pace. D. A bungee jumper on the way down in free-fall. E. An arrow shot from a bow until after it gets stuck in a tree’s bark.
Quiz3.2 The velocity-vs-time graph for a moving train is shown. If the acceleration in the time interval [0 s, 20 s] is decreased by a factor of 2, and the train continues to move at constant speed during [20 s, 40 s], what is the speed of the train at 40 s? A. 0 m/s B. 0.2 m/s C. 0.4 m/s D. 4 m/s E. 8 m/s
Quiz3.2 The graph in the figure shows the position of an object as a function of time. The letters H-L represent moments of time. At which moment shown (H, I, etc.) is the speed of the object the greatest? A. H B. I C. J D. K E. L Speed is the magnitude of the slope of the x-t plot
6 Distance vs. Displacement