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Kinesiology 2241A/B Lecture 17: FORCE AND MOTION (17)

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greenkangaroo690
20 Mar 2018
School
Western University
Department
Kinesiology
Course
Kinesiology 2241A/B
Professor
Thomas Richard Jenkyn

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Document Summary

If you measure the position of an object at two different times, then the average velocity is: t=time s=speed. If we take s1 and s2 so close together that they are infinitesimally close together, then we lose no information: this is instantaneous velocity, tells us how fast she is going at a certain moment. Looking at the speed of a runner in a 100 meter sprint. If you take the average speed over too long a time interval, then you miss the acceleration and deceleration features. Cyclic velocity: when the activity is cycling, i. e. a pattern of motion is repeated, such as walking, running, swimming, then we find average velocity as follows: Average v= distance per cycle x (# cycles / minute: example: running. Average v= stride length x (#strides / minute: example: swimming. Average v= distance per stroke x (#strokes / minute: remember: you have no information about the stroke or stride itself.

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Related Questions

4.2 #3

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The figure shows three graphs, A, B, C, which collectively describe the motion of an object in one dimension. The horizontal axis of each graph is time (symbol t). The vertical axes of the graphs are different. For one graph the vertical axis is position (symbol x), for another, it is the velocity (symbol v), and for another, it is acceleration (symbol a). Where the axes across is the point of zero for both time and the quantity corresponding to the vertical axis. Part A: For which sequence of graphs is the vertical coordinate position, velocity, and acceleration, respectively? (e.g., If you think graph Y is position versus time, graph X is velocity versus time, and graph Z is acceleration versus time, then your answer is Y, X, Z.). Multiple choice: 1)C, A, B 2)A, C, B 3)C, B, A 4)B, C, A 5)B, A, C 6)A, B, C. Part (b) Which one of the following situations can be most accurately represented by the graph, consistent with your answer to part (a)? (1) A car driving in the negative x-direction suddenly shifts into reverse and, with tires spinning, slows to a momentary stop before beginning to move in the position x-direction. (2)A car driving in the position x-direction slams on its brakes and comes to rest. (3) A rock is dropped from the rest from the top of a tall building. Assume air drag can be neglected, in which case its speed increases by the same amount each second. Take upward to be the position x-direction. (4) A sprinter runs a 100-meter dash and she runs in the negative x-direction. Starting from rest, she has a constant acceleration for the first 50 meters, then a constant speed for the remaining 50. Multiple choices: 1)4, 2)3, 3)2, 4)1.