Lab1MeasurementsCalculationsQMPHYS1115Rev8.20.2023

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Lab 1: Measurements and Calculations © 2023 by Orlando Patricio & Ricky Ramos adapted from Physical Science by Salinas and other links Name: Abigail De Leon INSTRUCTIONS: (1) Download this lab document and type out answers on the space provided for then save your answers. (2) If the spacing automatically moves, adjust so that your answers are not all over the place. (3) Upload this document, with your answers on it, on the designated Lab 1 Dropbox on Canvas Lab Reports/Module Tab. (4) If possible, ALL answers must in green font or highlighted in green or yellow. Do NOT delete anything in this lab document. Safety Before conducting any lab activity in this course, LC students are required to read the Flinn Lab Safety Procedure/Contract (posted on Canvas Modules Tab) and watch the online Flinn Safety Video. To watch the safety video now, hover mouse on the link and press at the same time ctrl and left click the link: https://www.youtube.com/watch? v=HLaOJKD9iDg . Remember to take Lab Quiz 1 (Lab Safety) on Canvas (use Lockdown Browser and Webcam). Grading Policy for Lab Reports WITH Pre-/Post-lab Questions Grading Policy for Lab Reports WITHOUT Pre-/Post-lab Questions Completeness and accuracy of answers (with required screenshots) for the: 1. Warm-up and lab activities - 70% 2. Pre-/Post-lab questions - 10% 3. Conclusions and real-life applications - 20% Completeness and accuracy of answers (with required screenshots) for the: 1. Warm-up and lab activities - 80% 2. Conclusions & real-life applications - 20% Purposes/Objectives: In this lab, you will be able to: (1) apply scientific method and analyze data mathematically. (2) calculate percent error and uncertainty in measurements. (3) differentiate accuracy & precision.
(4) determine density of some materials. Background A. The Scientific Method Read The Scientific Method . To view about the Scientific Method, hover your mouse on the link and press ctrl + left click at the same time. B. Percent Error Read Calculate Percent Error . To view about how to calculate percent error, hover your mouse on the link and press ctrl + left click at the same time. C. Uncertainty in Measurement It is important to realize that any measurement will always contain some degree of uncertainty. The uncertainty of the measurement is determined by the scale of the measuring device. The smaller the unit you use to measure with, the more precise the measurement is. Video Link - Accuracy & Precision To view about accuracy vs. precision, hover your mouse on the above link and press ctrl + left click at the same time. Precision vs. Accuracy: Precision - how close individual measurements agree with each other. Accuracy - how close individual measurements agree with the true or accepted value. Accurate number = small errors Precise number = small uncertainty
Prelab Questions Submit your pre-lab answers on the spaces provided below, labeled as Type answer here (inside the boxes below). 1. Do you think a single measurement will be very close to the mean of 10 similar measurements? What do you think "close" means? 2. Can you think of any problems you might have in measuring the time it takes a ball to drop from 2 m (high)? A single measurement can be considered very close to the mean of 10 similar measurements as it means the measurements are precise and accurate. "Close" determines the difference between a single measurement and its mean is small. Meaning the results will be consistent and reliable, which will reflect its results based on accuracy and precision. Problems that may affect the time when measuring a ball to drop 2 meters could be air resistance, as it may affect the balls speed, causing it to slow down or create inaccuracies in timing.
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