Lab 9

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Texas Tech University *

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1403

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Mechanical Engineering

Date

Apr 3, 2024

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pdf

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Uploaded by gisellepaz71

Lab 9 Report Section 09: Work - Energy Activity Pivot Interactivities Giselle Paz 6/26/21 PHYS 1403

INTRODUCTION In this lab, we will explore work as well as energy with a spring . Specifically, the relationship between the work stored in the spring , and the velocity at which the spring can launch an object . To learn this, in this experimental video, we use a spring that launches a cart from three different points of view: entire event, release, and spring stretch. We also learn about force constant. MATERIALS In this lab experiment, we used the following materials: ● Spring ● Ruler ● Timer ● Cart ● Scissors ● String PROCEDURE 1. Allow the video to fully play and watch the full event (cart launched by a spring). 2. We will be finding the relationship between the amount of work that is required to stretch the spring and the resulting velocity. To do so, we will first select a cart mass (choose 502 g ). Then, begin with Spring Stretch 1 and record the distance for which the spring is stretched before the launch using the spring stretch ruler ( 8 cm ). * Make sure the point of view is on spring stretch.

3. Because we are trying to also find velocity, we will record the time. To do this, we will simply change the point of view to release . In addition, change to the ruler that states, “ the ruler calibrates to measure cart motion ”. Then, pause the video once the string is cut, place the ruler above the green dot, and allow the cart to move until it reaches the end of the 30 cm. While this occurs, record the time (make sure to reset the timer after the string has been cut and stop it once it has reached 30 cm). *The time you should end with is 0.800000 sec 4. You will continue until you have collected a total of 5 data points each for the stretch options 1-5. You will collect this data using the same steps as above. Force Constant 1. You will be performing another experiment to determine the force constant of the spring. While using the spring you will also use disks each having a mass of 100g. For each of the 5 disks, you will record the number of centimeters that each spring stretches. First, begin by placing the ruler before the spring has moved. 2. Next, allow the spring to stretch with one disk. Record your measurement ( 3.5 cm ). 3. Continue using the same steps until you have recorded all 5 disks.

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DATA & DATA ANALYSIS The table below displays the spring stretch, the work (formula= .5*26* spring stretch^2), delta x cart/distance (30 cm for all), change in time, velocity (formula: change in x/change in time), and velocity squared. Here we can see the r elationship between the amount of work that was required to stretch the spring and the velocity-linear graph. Force Constant The table and graph below determine the force constant of the spring. We obtain a linear graph that indicates a constant relationship - force and stretch are linear.

CONCLUSION The purpose of this lab was to analyze the relationship between work and energy . For us to learn and see this, we collect data and create a graph from our spring experiment. Our data resulted in a linear graph which showed us the constant relationship that work and energy have. In addition, we were able to also learn about force constant. We were able to take a closer look at the spring stretch and examine the table/graph we got. We saw that we also had a linear graph which again tells us that force and the spring stretch have a constant relationship. PERSONAL LEARNING EXPERIENCE I enjoyed this lab! I was able to learn about the relationship between work and energy. I was easily able to understand this concept after I had collected all the data from the experiment. Being able to measure and record data of the spring being stretched allows me to make the connections of how work and energy correlate. Not only was the video helpful, but so were the graphs and tables. Seeing that our data resulted in a linear graph displayed the relationship of work and energy. I also learned about the force constant of the spring. I was able to see that the force and elongation of the spring/stretch had a linear graph which display’s that the relationship is constant.