# Note! In this lab when you measure, round all measurements to the nearest meter!

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23 ...Name(s) Speed and the Two-Step Objective: In this lab, you will measure and graph your speed and acceleration as you walk from o another. Step 1: Marking Your Space. You will use the hallway or some other large area to measure a dis string and a meter stick. For our class, we can skip this step because the tiles on the floor are exa Use masking tape to mark a section of tile that equals 20 feet. We will be going into the hallway fo experiment. Do not disturb other classes. Step 2: Speed of a Shuffle Have one person in your group shuffle the length. This means the person s feet should never lea to move you will need to slide your foot in front of the other. This should be a very slow pace. Ano group should time how long it takes (in seconds) to move the 20 feet and record it in the data table. that you can get an average. Step 3: Speed of a Heel-to-Toe Walk This time, you can lift your foot, but must walk by placing one foot exactly at the toe of the other foot with each step. This should also be a fairly slow pace because your steps are tiny. Step 4: Normal Walk For this trial, you can step normally across the length. Try to keep your pace constant. Step 5: Repeat this process by switching to the other person in your group

24 Name of Person Walking: Trial (Person 1) Time to Move 20 ft Shuffle (trial 1) Shuffle (trial 2) Shuffle (trial 3) Average Heel-to-Toe (trial 1) Heel-to-Toe (trial 2) Heel-to-Toe (trial 3) Average Normal Walk (trial 1) Normal Walk (trial 2) Normal Walk (trial 3) Average Name of Person Walking: Trial (Person 1) Time to Move 20 ft Shuffle (trial 1) Shuffle (trial 2) Shuffle (trial 3) Average Heel-to-Toe (trial 1) Heel-to-Toe (trial 2) Heel-to-Toe (trial 3) Average Normal Walk (trial 1) Normal Walk (trial 2) Normal Walk (trial 3) Average Speed (feet/s) Speed (feet/s) ***From this point on, you will be doing the work on you Step 5: Conversions for Fun use the ratio to determin walk (use average) in a minute Now convert your feet per minute to feet per hour (there in an hour) Finally, determine your speed in miles per hour using t 1 mile = 5380 feet. Set up a ratio similar to those above Step 6: Graph your data. Compare the AVERAGE fo walks you and your partner did (shuffle, heel-to-toe, an making a BAR graph. You may want to use different c distinguish between you and your partner.

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30 The moving man Procedure Go to and find The Moving Man simulation under the category of motion. 1. After The Moving Man is open leave the position graph and the velocity graph open but close the acceleration graph by clicking the symbol in the upper righthand corner of the graph. Investigate Moving Man by dragging the dude around with your mouse. This will give you very jumpy data, especially in the acceleration graph why? Now try making the man move using the slider arrows. Use the playback features to look at the graphs. While you make observations, discuss in your group the reasons the graphs look the way they do. 2. Making predictions: on your paper, sketch six of the following graphs. Label them A F. For each of the six scenarios below, in one color, PREDICT what the distance vs. time and velocity vs. time will look like. Don t be afraid to be wrong and don t cheat by looking at Moving Man first! Leave some space for explanations beside or below each graph. A) A man moving from the center of the screen (0 m) to the house (8m) at a slow, steady pace. of the graphs: Explain your reasoning for the appearance

31 B) A man moving from 0 to the house at a faster pace than above. of the graphs: Explain your reasoning for the appearance C) A man standing still at 4 m. of the graphs: Explain your reasoning for the appearance

32 D) A man moving from 0 to the house at a fast pace then moving back to 0 at a slower pace. of the graphs: Explain your reasoning for the appearance 5. Individually write a possible scenario for the following graph. Then compare your scenario with your lab partners to check if it is reasonable. time

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36 Name: Date: Hour: Calculations with Velocity and Acceleration Read and solve each of the following problems. Be sure to show all of your work (given, equation, work, and answer with the proper units) Velocity Equations: 1. What distance is traveled by a police car that moves at a constant speed of 2.5 m/s for 20s? Given: v= d= t= Equation & Work: Answer: 2. What is the speed of a horse that travels 45 m in 2 minutes? (remember to convert minutes to seconds) Given: Equation & Work: v= d= t= Answer: 3. How long would it take for a commercial jet to get from St. Louis to New York, a distance of 1,406 km, if it travels at an average velocity of 156 m/s. (You will also need to do some conversions here to match your units) Given: Work: v= d= t= Equation & Answer:

37 Acceleration Equations: 4. A skier takes off from the top of the ski run and reaches a speed of 24 m/s in 4 seconds. What is the skier s acceleration? Given: Work: vi = vf = t = a = Equation & Answer 5. A child on a skateboard is traveling at a velocity of 8 m/s down a hill. At the bottom of the hill, he slows down and comes to a stop in 4 seconds. Calculate the sled s deceleration (negative acceleration). Given: vi = vf = t = a = Answer Equation & Work: 6. A skydiver jumps out of a plane and as he falls he has an acceleration of 9.8 m/s2. How many seconds will it take to reach a speed of 28.5 m/s? Given: vi = vf = t = a = Equation & Work: Answer

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