Lab Report Analysis 

The Similarities and Differences within Three Lab reports bridging Towards Engineering

Noel Vazquez-Molina 

ENGL 21007 – Writing for Engineers

The City College of New York

Professor Duffy

March 13th, 2026

Abstract 

Scientific Lab reports are essential tools for communicating experimental findings and applying scientific knowledge to engineering practice. This essay analyzes and compares three lab reports : a Physics free fall experiment measuring the gravitational acceleration on earth, a physics pendulum experiment investigating oscillatory motion and a psychology experiment examining memory span. This essay will analyze all parts of the Lab reports and together demonstrate how scientific research across disciplines supports engineering by providing both physical and cognitive insights that guide the development of effective and reliable technologies.

Rhetorical Analysis of Three Lab reports in relation to Engineering 

This essay will show the connection to engineering even if the topics are different when considering the knowledge from these experiments can be applied. Both Lab 1 and 2 are physics lab reports that provide essential insights into gravity, motion, and oscillation, which engineers in use when designing machines, buildings, transportation systems and other mechanical structures. Meanwhile in lab 3 which focuses on psychology and memory, it contributes to human centered engineering where engineers design systems that account for human cognitive abilities and limitations. One major similarity among all three reports is that they follow the traditional scientific format that allows researchers to clearly present their objectives, explain their experimental procedures, and analyze their findings. Such organization is important not only in scientific research but also in engineering, where clear documentation is necessary for designing, testing and improving technological systems. The two physics lab reports on their experiments rely heavily on mathematical equations, controlled variables, and precise measurements. Their results are often displayed through graphs and calculations used to determine values such as gravitational acceleration. In contrast to the third Lab report on memory, psychologists focus on human cognition and use statistical analysis to interpret patterns in participants and their memory performances.

Abstract and Introduction

All lab reports include an abstract and introduction.The abstract in lab reports provides a brief summary of the entire experiment, including objectives, methods, key results and conclusions which allows readers such as scientists, students or engineers to quickly determine whether the study is relevant to their interest without having to read the entire lab report. The introduction within the lab report gives more detailed background information about the topic and explains the scientific principles and theories behind conducting the experiment and shows the connections between all existing knowledge. In all three lab reports the abstract and introduction share the same purpose of sharing the common purpose to introduce the research topic and explaining the significance behind the experiment yet differ from the way they established their scientific context. Both lab reports 1 and 2 focus heavily on theoretical explanations and mathematical equations related to gravity and motion. Lab report 1 introduces the concept that objects accelerate toward earth due to gravitational force and references the laws of motion created from Isaac Newton. Similarly in Lab report 2 the pendulum report begins by describing the forces acting on a pendulum and derives equations that predict the period of oscillation. Lab report 3 , the psychology introduction focuses on previous studies and hypotheses about how people recall digits, letters and words. Despite these differences in approach, all three introductions establish the purpose of the experiment and explain why the study is important for understanding scientific principles that can be applied in the real world and engineering context.

Materials and Methods

The materials and method sections of the three lab reports show both similarities and differences in how each experiment explains its procedure and equipment. In labs 1 and 2 which are both physics related reports the materials and methods will be more different that lab 3 which focus on psychology. Lab 1 which focus on the free-fall experiment uses objects such as a metal ball, measuring tools, and timing devices to record fall times from different heights, providing detailed and organized materials, then divided into short paragraphs to celery explain the use of each object and explain step by step allowing the reader to understand how results were made. While in lab 2  they use washed masses, a string, a photogate timer and measuring instruments to determine the period of oscillation. This section is more simpler than the first lab report as it focuses mainly on the experimental setup and procedure rather than providing extended explanations of the design. These methods focus on controlling physical variables such as height, length, mass and time. In contrast lab 3 human participants are used as mechanical equipment but gives out less detailed information.  The materials include a computer program that presents lists of digits, letters, words along with paper and pencil for recording responses. The method involves participants recalling these items in sequences to see how much they remember, leading to figuring out memory span. This section within the lab reports are important because they show how scientific experiments are carefully designed and controlled which is essential in engineering and scientific research.

Results

All three lab reports contained results sections that presented useful findings, but each one differed in how clearly and efficiently the information was communicated to the audience. Overall the results sections of the three labs tended to include more information than necessary which made most parts of the lab reports longer and reduced repetition between text and images, which would have made the section cleaner and more concise.Lab 2 was the most del=tailed and somewhat drawn out. The section included descriptive images of multiple trails and tested how masses, amplitude and length affected the period on the pendulum. In Lab 3 it also contained a long results section but the information was more concise and focused on the findings of the analysis. This section presented the mean number of items participants were able to recall after a period of time which would be digits, letters, and words. The information was relevant but the section could have been more organized reducing repetition and focus more directly on the most important data and statistical findings 

Conclusion

Compared to the results section, all three of the lab reports include strong and well written conclusions that effectively summarizes the experiments and their findings. The conclusion of Lab 1, the free fall gravity experiment, was written in a way that allowed the audience to understand the overall purpose, procedure and findings of the experiment without having to return to the earlier parts in the Report. Lab report 2, the pendulum experiment and Lab 3 the memory experiment, were shorter but still were both able to effectively summarize the results and studies Lab 2 explained how the results showed that the period of a pendulum depends on the length of the string rather than the mass of the bob or small changes in amplitude. Lab 3 still maintained focus on explaining their finds and its significance. Overall the lab reports were clearly written and followed the standard structure of using scientific language. Each lab report successfully stated the purpose of the experiment and summarized the most important findings they had in the conclusion section. Among the three reports, lab 2 was the most balanced in terms of clarity and organization with the most details making it easier to read and understand for the audience. The other reports were also informative but could have reduced and cut off repeating information in earlier sections which could have made it equally effective in communicating their findings.

References 

Advanced Instructional Systems, Inc. and Arizona State University Department of Physics. The Pendulum Objectives. 2016, www.webassign.net/asucolphysmechl2/lab_9/manual.pdf. Accessed 10 Mar. 2026.

University of Maryland . “Psychology Lab Report (Docx) – CliffsNotes.” Cliffsnotes.com, 2024, www.cliffsnotes.com/study-notes/6172298. Accessed 10 Mar. 2026.

Yolkin, Boris. “Measuring the Magnitude of the Gravitational Field of Earth G.” Purdue.edu, 2024, www.physics.purdue.edu/~sergei/classes/phys342l.