Unit 1 Project "Full stop Ahead"
By: Amaya Graham

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Activity 1

Assume you are traveling on a dry road and have an average reaction time. The formula d=0.044s^2 + 1.1s gives you a safe stopping distance d in feet, where s is your speed in mi/h. Make a table of values for speeds of 10, 20, 30, 40, 50, and 60, mi/h. Then, graph the function.

Table
Graph

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Activity 2

Part 1:

Suppose a car left a skid mark d feet long. The formulas will estimate the speed s in miles per hour at which the car was traveling when the brakes were applied. Use the formulas to complete the table. Round to the nearest mile per hour.

Part 2:

Why do you think the estimates of speed do not double when the skid marks double in length? Based on these results, what conclusions can you make about safe driving between cars?

I think they do not double because stop times depend on the road conditions and the road conditions were different. To be a safe driver there should be at least 2 seconds between you and the car in front of you, so that you have enough time to react.

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Activity 3

Suppose you are driving on a dry road with 150 ft (about 10 car lengths) between your car and the car in front of you. Use the formula from Activity 1 to find the maximum speed you should be traveling in order to leave a safe stopping distance.

The maximum speed I should be traveling in order to leave a safe stopping distance is 47mph.

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Activity 4

Work with a group of your classmates to plan a skit that will demonstrate what you have learned about safe distances in driving. Illustrate the relationship among reaction times, road conditions,speeds, and stopping distances. Click the button to view the video.

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