Daniel Reyes Ryan Mack Physics CP, Section 1 Run, Skip, Walk, Rest 10/1/15 10/13/15

Abstract Throughout the experiment I have confronted several obstacles, one being trying to gather accurate data. As a result, we did the experiment several times until we were satisfied with our results. For instance, the prominent reason for performing this experiment was to grasp a better interpretation of a position versus time graph. Furthermore, after many trials and errors, it is accurate to say that following directions is very crucial because of done otherwise it will reflect in the outcome.

Materials tape measure chalk stopwatches

Procedure

To begin with, we used a chalk to mark a starting line on the floor, then we measured in a straight line and made marks at 5, 10, and 15 m from the starting line. Then, with the aid of a partner we were able to organize who would be the runner, it was crucial that the runner maintained a consistent velocity during each segment of the trial. Furthermore, we had to choose three members to be temporary timers, it was strongly suggested that there should be one timer at each of the 5 m, 10 m, and 15m marks. Their task was to start timing when the runner begins and terminate when the runner had reached the finish line. The runner runs, walks, rests, and skips at a consistent velocity between the marks made in the previous step. Finally, once a student had completed his objective this whole process had to be replicated for a new runner. Simultaneously during the course of the experiment a student had to record all the data.

Data

Runner: Ryan Mack Initial Position:

Change in position (m) Time (s) Motion

(5) 5m 2.01 Run

(10) 5m 2.83 Skip

(10) 0m 10 Rest

(15) 5m 5.3 Walk

Runner: Daniel Reyes Initial Position:

Change in position (m) Time (s) Motion

(5) 5m 2.56 Run

(10) 5m 3.29 Skip

(10) 0m 10.13 Rest

(15) 5m 5.10 Walk

Error Analysis After an elongated time of pondering I have come to conclude that there were only few

minor errors. First off, because of my ignorance towards how crucial directions can be when needed to be used in order to record the correct set of data. It is accurate to say that it is more efficient if each data is recorded right away.

In addition, the experiment went well except for the fact that the measurements on the floor were not labeled correctly. In other words, the error was in the handling of the equipment.

Conclusion and Discussion

Throughout my experience in this lab, I learned how to successfully grasp a better intellectual interpretation of the shape of a position in contrast to a time graph. Although this experiment consisted of recording data it prevailed a bigger picture in the concept of recording several pieces of information and comparing them on a line graph. Now, the commencement of the lab began with the distribution of the materials. Specifically the chalk, tape measure, and phones that were utilized for stopwatches. Then, we had a volunteer the label the floor accordingly to the instructions. Subsequently, a student was asked to skip, run, walk, and rest; each accomplished in its own segment. Then the information was collected and compared with the results of other students in the group. Although the lab was challenging and called for perseverance through tedious tiresome work, there is not a fraction of a doubt in my mind that would dismiss the experience if given the opportunity. However, at the same time there are several improvements that I would strongly suggest. For instance, I think that the bar for students should not have been raised very high, in the aspect of using several of motions. Whereas, the use of only two would have been more than enough to work with. This would have alleviated the stress in the aspect of organizing all

the data. In a nutshell, besides the need for tweaking the number of motions in the lab everything else was seamless.

Questions 1)Draw the position versus time graph for both runners on the same piece of graph paper, Use a different color for each runner. 2)Why can we use straight lines on our position versus time graphs for this lab? 3)Which runner had the largest average skipping speed? Runner #1 had the largest average skipping speed. 4)Without doing any calculations, do you think the runners ever had the same speed (not necessarily at the same time)? If so, when? What makes you think so? No, I don’t the runners didn’t have the same speed because their times were different. 5)Determine the average velocity for all motions and fill in the chart. What method did you use?

Runner: 1

Motion (Run skip, rest, or walk) Average velocity (m/s)

Motion 1: Run 2.5 m/s

Motion 2: Skip 1.8 m/s

Motion 3: Rest 0 m/s

Motion 4: Walk 1 m/s

Average velocity for entire trial: 1.3 m/s

Runner: 2

Motion (Run skip, rest, or walk) Average velocity (m/s)

Motion 1: Run 2 m/s

Motion 2: Skip 1.5 m/s

Motion 3: Rest 0 m/s

Motion 4: Walk 1 m/s

Average velocity for entire trial: 1.1 m/s

6) Produce a velocity versus time graph for both runners on the same graph. 7) Consider the following hypothetical lab data for two runners who start at the same time.

Runner #2 Initial Position: 10 m

Motion Position (m) Times (s)

Rest 0 10

Skip ­5 12.3

Run +5 14.5

Walk ­5 17.5

a. Produce a position versus time graph for both runners on the same graph. b. Do the runners ever have the same velocity at the same time? How can you tell? c. At what time(s) are the runners at the same place at the same time? d. Which is the faster runner? Among both tables, the fastest runner according to the data

is Ryan.