HW 2: SPEED TIME GRAPHS

SPEED-TIME GRAPHS

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INTRODUCTION

In the first lesson of this unit you learned about how to use speed-time graphs to represent the motion of objects that were either speeding up or slowing down. In this extension activity, you will learn about how to use speed-time graphs to determine the rate of change in speed. Another purpose of this extension is to let you investigate how to use speed-time graphs to represent objects thal are slowing down.

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The final frame of the movie on the last slide is shown to the left. It includes the speed-time graph for the yellow car.

Notice that the three speed-time graphs have different slopes. The slope of the line on the speed-time graph equals the rate of change of speed. Use the graphs to answer the three questions below.

To the right are four graphs representing possible motions of a car over a 6-sec period.

If the cart and fan unit shown in the picture below were released from rest, it would normally speed up to the left. Suppose, however, the cart/fan was first given a strong push to the right.

Earlier in this activity, you learned that for objects speeding up, the slope of the line on the speed-time graph was related to the rate of speeding up: a steeper slope meant the object was speeding up at a higher rate.

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