# Measurement and error analysis physics lab

3 Propagation of Errors Significant figure rules are sufficient when you don't have god estimates for the measurement errors. 1 Graphical Analysis and Errors Graphical Analysis and Errors – MBL I. Occasionally we include temperature, electrical charge or light intensity. Laboratory work is a very important part of a course in General Physics. This lab will involve making several measurements of the fundamental units of length, mass, and time. Provide a statement of the physical theory or principle observed during the exper-iment. In Physics, like every other experimental science, one cannot make any measurement without having some degree of uncertainty. In this course you will be expected to master ME4320 Instrumentation and Measurement Lab Use this site to solve the pre-lab asssignment, as well as print a hardcopy of the experiment procedure and bring it to the Experimental Uncertainties (Errors) In the Analysis section of the lab report, you should identify significant sources of experimental errors. Our experiment may be similar to one you have done in high school, however, the mathematical analysis will be more sophisticated. Arpita Upadhyaya and Dr. Experimental Description 1. Have you partner measure the actual distance between your hands using a ruler. RANDOM AND SYSTEMATIC ERRORS C. Please keep a pen and paper ready for rough work but keep your books away. , how you estimated the uncertainty) In some cases there is no way to compare the measurement to a correct value, (i. Brown in January 2012, and revised again by Martin Simon in January 2013 to accomodate the new myDAQs. Each lab report included in your course notebook will be organized in a similar manner. 3 Quantifying errors in measurements The statistical method for nding the best value for a measurement is to repeat the measurement many times and then take the average value. The uncertainties are of two kinds: (1) random errors, or (2) systematic errors. Appendix at the end of this lab manual contains accuracy data for most instruments you will use), but the best way to assess the accuracy of a measurement is to compare with a known standard. the lab The School of Physics First Year Teaching Laboratories are intended to be places Every measurement that we make in the laboratory has some degree of uncertainty associated with it simply because no measuring device is perfect. Pengra, University of Washington, and L. Repeat Steps 2 & 3, timing nine complete swings of the pendulum instead of a single swing. • Repeat the measurement and use the range, or better yet, the standard deviation – really we need a statistical analysis; (typically, the better the analysis the lower the uncertainty) • (state what you do, i. 2. For any unexcused absence, you will lose the lab participation credit. A cart resting on a horizontal surface accelerates because of the tension in the string it's connected to. (see CD setup). Part I: Rough Measurement Analysis of Experimental Uncertainties: Density Measurement Physics Lab II Objective This laboratory exercise allows students to estimate and analyze experimental uncer-tainties. Standard error of density measurement *calculations shown page after Table 3. Example Conclusion Physics 1CL Fall 2010 Example Conclusion In this lab, we studied the motion of a tennis ball on a string moving in horizontal circles. You want to calculate the average of these values taking into account the uncertainty associated with each individual one. Let us start with a discussion of some of the possible sources of errors in a scienti c experiment: The accuracy of a measurement is how close the measurement is to the true value of the quantity being measured. It will be up to you to correctly propagate the errors from the measured Discussion: Normally the time spent in physics lab is too limited to take repeated measurements and investigate the statistical behavior of random error, but this week we will take time to do a simple experiment which will demonstrate the statistical Science enginering lab report experiment 1 (physical quantities aand measurement) 1. Physics theories are tested and refined and are only retained when they are proven to be an accurate description of nature. Failure to do this will require you to re-accomplish the lab individually. Part II (Volume of Table-Top) 1. Random uncertainties can be evaluated through statistical analysis and can be reduced by averaging over a large number of observations (see “standard error” later in this document). Such variation of pattern is noise. What is the resolution of the ruler? Use this to determine the uncertainty in 6 Although "uncertainty" is clearly the best word to use, the words "error" and "uncertainty" are used interchangeably. Support your chosen claim with evidence and justify the connection between the claim and the evidence with text-based and mathematical reasoning. What is the resolution of the ruler? Use this to determine the uncertainty in measurement such as of g can only be determined by means of an experiment, and since a perfect experimental apparatus does not exist it is impossible even in principle to ever know g perfectly. It reinforces the student’s The standard deviation of the measurement is the "random error" of the measurement. As you may know, most fields in the physical sciences are bifurcated into two branches: theoryand experiment. Equipment Cardboard Box Meter Stick Triple Beam Scale with Additional Weight Set (scale may be shared with other groups) Burette with stand Beaker with water Introduction On physics we can determinate volume, mass, and density how by formulas. E. 6 min, then we can say that the uncertainty is probably of the order of Lab Report Format3 - 1 - Format for Formal Lab Reports Revised January 7, 2009 A formal lab report is a record of your laboratory activities and should include the following sections: Introduction, Experimental Procedure, Data, Analysis and Discussion and Conclusion. 8*10^3 kg/m^3. Measurment and Error Analysis In experimental physics, measurements Physics 10 Lab 1: Introduction to Measurement Units and Measurement One of the most important steps in applying the scientific method is experiment: testing the prediction of a hypothesis. For any content/service related issues please contact on this toll free number . From the free body diagram shown in Figure 3, we see that the total force on the mass is the force of gravity minus the string’s tension. Download the Lab Report Template. or in the fundamental physics underlying the experiment. If one measured a large number of 97 Appendix A: Error Analysis for the Physics Labs . For this situation, it may be possible to calibrate the balances with a standard mass that is accurate In this lab, students gain hands-on experience in obtaining precise and accurate measurements, which provide the data for analysis of experimental results. Some possible sources of errors in the lab includes instrumental or observational errors. In this lab, you design an experiment to test a hypothesis about the geometry of circles. Record this value in the table provided. Durkin July 5, 1992 DISCLAIMER: There are many ways to write up a lab report, none of them superior to any other. Make-up labs will only be arranged when notification is made (via email or phone) prior to the assigned lab. One of the main goals of the Physics Lab is that you learn about error analysis and the role it plays in Any physical science requires measurement. , Rather than providing a dry collection of equations, this article will focus on the experimental uncertainty analysis of an undergraduate physics lab experiment in which a pendulum is used to estimate the value of the local gravitational acceleration constant g. All theories have to be proven by experiments and new discoveries mostly come from very advanced measurements. 3. A proper experiment must report for each measured quantity both a “best” value and an uncertainty. Thus it is necessary to learn the techniques for estimating them. In physics, as in every other experimental science, one cannot make any measurement without having some degree of uncertainty. L. Science and experiments. Accompanying theexperiments are suggested pre lab activities that provide an - orientation to eachlab. e. Although they are pitched at a relatively elementary level, they Our calorimeter lab utilized an aluminum calorimeter cup. REPORTING YOUR BEST ESTIMATE OF A MEASUREMENT II I. Statistical or Random Errors. All physical laws, theories, and formulae were developed based on A random error, as the name suggests, is random in nature and very difficult to predict. Environmental errors can also occur inside the lab. ANALYSIS Result from measurement taken show various reading achieve although the measurement is done with constancy which give a reading that is too high, sometimes a reading that is too low. errors) and random errors • Uncertainty analysis addresses fidelity and is used in different phases of an experiment, from initial planning to final reporting – Attention is needed to ensure uncertainties do not invalidate your efforts • In propagating uncorrelated errors from individual measurement to has little or no meaning and will result in a large associated uncertainty. Introduction to Measurements & Error Analysis Department of Physics and Astronomy 3 Accuracy is often reported quantitatively by using relative error: expected value 5. Really, 6 ft is only slightly more helpful than the utterly meaningless response 6 would be. COM does not The functional form quoted for n(x) is a theoretical prediction based on certain assumptions about the measurement process (not discussed here). Discussion: Normally the time spent in physics lab is too limited to take repeated measurements and investigate the statistical behavior of random error, but this week we will take time to do a simple experiment which will demonstrate the statistical Lab: Horizontally Launched Projectiles (with uncertainty analysis) This is a traditional lab taught by many physics instructors. 1b September11,2018 The numbers you record will differ. One of our systematic errors was a result of a reaction between the aluminum cup and hydrochloric acid, which lead to an increase in heat production. Biomedical and Biological Sciences 116,165 views Measurement Analysis Lab Summary. If a desired quantity can be found directly from a single measurement, then the uncertainty in the quantity is completely determined by the precision of the measurement. Stenzel. The two boards should be separated by a small slit to let the laser light through. Physics 174: Physics Lab Introduction, Spring 2017 Dr. The Wheatstone bridge is very important -- Cliff Swartz, Physics Today 37(1999), 388. Before you come to lab A. PRECISION AND ACCURACY B. ) Repeat your measurement of travel times until the standard deviation seems to have reached a constant. 8 Experiment 1: Measurement & Analysis PROCEDURE PART 1: Estimating Length 1. Typically we measure simple quantities of only three types: mass, length, and time. E. Five values should be considered as a minimum. 12 cm of the estimated average of 31. In those courses you studied macroscopic physics such as falling bodies and magnetic fields physics with vernier lab answers FB2FD6C88444D96C7897251AE5E55227 Musings: January-April 2011 (archive) - b Bruner hitcounter Contact E-mail APSATTV. e e e / to complete the lab in the required time and make sense of the data. Equipment List This lab helped us learn how to make measurements using a caliper and how to use measurement uncertainties to find the density of the steel ball and compare it with the accepted value of 7. 4. Dr. Students will calculate the density of brass and chrome. 086 cm The standard deviation is: The significance of the standard deviation is this: if you now make one more measurement using the same meter stick, you can reasonably expect (with about 68% confidence) that the new measurement will be within 0. ) 3. Although they are pitched at a relatively elementary level, they Given the “arm” and load setup in Figure 1, determine the equations needed for each of the following calculations: A) Calculate all of the clockwise (negative) torques about the upper arm/lower arm joint as a function of the length of the arm, l arm, the mass of the arm, m arm, and the mass of the load, m load. 28 Purdue University Physics 152L Measurement Analysis 1 for a measurement decreases, the percentage uncertainty –Z Z £100% decreases, and so the measurement deviates less from perfection. There are conventions which you should learn and follow for how to express numbers so as to properly indicate their significant figures. In this version, students use effective measurement technique as presented in this module. PHYSICS 126 ERROR AND UNCERTAINTY In Physics, like every other experimental science, one cannot make any measurement without having some degree of uncertainty. The Bullseye Analogy for Understanding the Difference between Accuracy and Precision As an example, consider the following table of 10 successive measurements of the volume of a pipet which is labeled as 10 mL: Any physical science requires measurement. all data clearly recorded (use a data table) using the appropriate number if significant digits and correct units. However, if we repeat the experiment and get 23. Usually interpolation refers to estimating the position of a pointer between marks on a scale, both the marks and the space between being : Lab 1: Measurement and Uncertainty Pendulum Period Introduction Physics is primarily an experimental science. Thus it is but we expect you to use them in virtually all measurements and analysis. If you do have good estimates for the measurement errors then a Finish the Data Analysis. Do not list all Physics 40 Lab 1: Tests of Newton’s Second Law January 28th, 2008, Section 2 Lynda Williams Lab Partners: Madonna, Hilary Clinton & Angie Jolie Abstract Our primary objective was to test the validity of Newton's Second Law of Motion which predicts that the acceleration due to gravity of an object is independent of object’s mass. The key word here is "statistical independence"! In the real world that is not an assumption that one can make without testing for it. scale provides an alternative measurement used for comparison purposes in this laboratory exercise. Students will submit the pre-lab online through Canvas before the lab as assigned. It occurs because there are a very large number of parameters beyond the control of the experimenter that may interfere with the results of the experiment. How Can the Density of a Substance be Determined Accurately and Precisely? Prelab Assignment Before coming to lab: Read carefully the handout, "Lab Notebook Policy" Read this lab handout and then devise specific procedures for Activities 1 - 3 of this lab exercise. Each is a statistically independent measurement of the period with an experimental uncertainty associated with it. Read through this handout in its entirety. It is designed to give practice taking measurements, analyzing data, and drawing inferences without requiring any special knowledge about physics. In Excel, produce data tables for the measurements and calculations to be made below in each part. The key concept that distinguishes experimental science from theoretical science is uncertainty. D. In the argument analysis section of the lab report identify which claim you think is correct. 7. (page 3) 3. Also, in physics, we often use functional relationship to understand how one quantity varies as a function of another. all data clearly recorded (use a data table) along with estimates of uncertainty for each measurement. (for this lab any measurements and calculations should be stated in the standard form of: measurement = xbest ± ∆x) Part I (Using Measuring Devices) 1. The reports will be divided into labeled sections with each section intended to accomplish a specific purpose. This lab helped us learn how to make measurements using a caliper and how to use measurement uncertainties to find the density of the steel ball and compare it with the accepted value of 7. It is not necessary to generate typewritten text or computer plots. Let’s find Notes on Data Analysis and Experimental Uncertainty Prepared by David B. Using the correct significant figures the percent error in the density measurement is Physics 215 - Experiment 1 Measurement, Random Error & Error analysis σ is a measure of the scatter to be expected in the measurements. Finally, check that the data gathering activities fit within the scheduled 8 Experiment 1: Measurement & Analysis PROCEDURE PART 1: Estimating Length 1. Part of your lab experience should be learning how to organize and present your work in a scientific way. Conclusions are drawn from correlations between accepted density values and experimental values. B. There is also a Technical Physics sequence that allows students in the Technology programs to satisfy their requirements. L. The purpose of the pre lab is to get students thinking ahead to - gravity can be used to teach experimental design to advanced physics students. If we want to describe the behavior of the measurement, x, we can consider the probability that the measurement will lie within some speciﬂed range of measurement values. Graphical Analysis Graphs are vital tools for analyzing and displaying data. In reporting the results of an experiment, it is necessary to report this EXPERIMENT 5 PHYSICS 250 WHEATSTONE BRIDGE Apparatus Power supply Precision multimeter Precision resistors Wheatstone bridge Temperature bath Strain gauge Introduction During this laboratory period you will study the Wheatstone bridge, a special technique used in high-precision electrical DC measurements. Physics has to do alot with measurements on this lab report we measured the water displacement, and more things, but we were like eight people, so we had different results. Physics Lab Report Format General Remarks: Writing a lab report is the only way your TA will know what you have done during the lab and how well you have understood the process and the results. scales. This involves the estimation of uncertainties in measurement and in the values of quantities derived from them. In the laboratory you will have an opportunity to observe and discover those phenomena directly. Suresh Tonwar What the course is about: Physics 174 is an introductory Physics Lab that meets for one hour and 50 minutes each week in Room 3115 of the Physics Building. You can either keep the data in a ‘data sheet’ in excel or you can copy and paste them into your word document lab report. Mon to Sat - 11 AM to 8 PM Physics 136-2: General Physics Lab Laboratory Manual - Electricity and Magnetism NorthwesternUniversity Version1. -Vernier caliper is accurate to two decimal places (Vernier scale and main scale)-the Vernier scale has a 0 that moves, we use It to find a measurement to one decimal, by finding two numbers the zero on the Vernier scale lines up between on the main scale PHYSICS 183 - LAB Experiment 1 Fall 2004 2 6. Either way, be sure to label each part in your lab report. 3 and 10. Use a balance and meter stick to determine the relationship between the mass and radius of disks of different radii and calculate the uncertainty associated with the measured values. The discrepancy between the measured value and the true value of the quantity may arise from different sources. Pre-Lab Assignment. 1. Any physical science requires measurement. Physics 4BL: Electricity and Magnetism Lab manual UCLA Department of Physics and Astronomy This manual is adapted from the work of R. Notes on Data Analysis and Experimental Uncertainty Prepared by David B. Lab Reports Group lab reports are not allowed. The data points in Figure 4 were fitted to straight lines by the INTRODUCTION TO THE PHYSICS LABORATORY All of the laws of physics are expressions of experimentally observed phenomena in nature. measurement techniques covered in lab, or develop your own measurement technique to determine the number of pinto beans that are contained inside the plastic jar. The following sections are basically a very short summary of the main results Physics Lab Report Guidelines Summary The following is an outline of the requirements for a physics lab report. Calculate the standard deviation, F, of the distances. PART 2: MEASUREMENT AND ERROR. e:\sphs physics\labs and demos\lab instructions\measuring for pi\measuring for pi lab ~ preib. Thomas Dillman, Ohio Wesleyan University This set of notes has been adapted from ones given to Ohio Wesleyan University physics students in the introductory laboratories. Close your eyes and hold your hands about 50 cm apart on the table. Introduction: How is the circumference of a circle related to its diameter? In this lab, you design an experiment to test a hypothesis about the geometry of circles. Discuss the relevance of the experiment to 1291/2 Physics Lab Report Format General Remarks: Writing a lab report is the only way your TA will know what you have done during the lab and how well you have understood the process and the results. In reporting the results of an experiment, it is as essential to give the uncertainty, as it is to give the best-measured value. How can we characterize these probabilities? We can use the Using your picture, I can make that measurement 5 times and say that it's between, say, 10. They are for the most part different in character from those done in conjunction with Physics 150-151. But it really could be 15 because the hash marks are wrong, that's accuracy. Uncertainty of a measurement tool: all measurements have uncertainties and are only as accurate as the tool being used to make the measurement. The accuracy of measurements is often reduced by systematic errors, which are difficult to detect even for experienced research workers. In general, the theoretical aspect is taught in lectures, tutorials and by doing problems, while the experimental aspect is learned in the laboratory. You will need to familiarize In this lab you will measure three types of physics quantities: length, time, and mass. A pre-lab assignment is given in the lab procedure for each lab. Ideal for for AP, B and C, IB, and Guidelines for a Physics Lab Reports A laboratory report has three main functions: (1) To provide a record of the experiments and raw data included in the report, AP Physics 1 and 2 Lab Investigations: Student Guide to Data Analysis. Download the Logger Pro software and learn how to use it. The pendulum is ideal for this purpose because the basic physics is apparently so well understood, but just below the surface lie The experiments described in this manual are designed to accompany Physics 250. PHYS 107 – Introductory Physics – Laboratory – Lab Form Spring 2019 1 LAB 01 – Experimental Errors and Data Analysis Group: _____ (Lab section plus Group letter; for instance 01A for lab section 01, group A) Blue footnotes are discussions of general physics material that would break up the flow of explanation to include directly. For example, a measurement of (2 §1) m has a percentage uncertainty of 50%, or one part in two. The "error" of a measurement is not just the difference between the measured What Are Some Possible Sources of Errors in the Lab? Some possible sources of errors in the lab includes instrumental or observational errors. Faulty use of measurement equipment: for example, if a researcher consistently reads a graduated cylinder from above (as opposed to directly looking at the meniscus). For each section, your lab report should contain: a brief discussion of your procedure, which should identify what measuring instruments you used. The digit 2 is an estimate, so it is the uncertain digit.  If you have to perform any computations using the measured value then you can estimate the standard deviation of the computed value through the propagation of errors. This means that a measurement with a big uncertainty should not contribute as much as a measurement with a much smaller uncertainty. Significant Figures. To make a measurement with the vernier caliper, the jaws must be tightly closed around an object. a sample calculation for each part. The reaction used hydrochloric acid. Guidelines for Lab Reporting. View Lab Report - Measurement and Error Analysis Lab 2 from PHYS 2425 at Austin Community College. Table 1 into the first row of Table 4 (no need to rewrite their uncertainty). The problem here is that no range indicating the quality of the measurement, or experimental uncertainty, has been assigned to the quantity, 6 ft. A. No measurement of any physical quantity is ever perfectly accurate, except possibly the counting of objects. The significant figures of a (measured or calculated) quantity are the meaningful digits in it. Graphs allow us to explore the relationship between two quantities -- an independent variable usually plotted on the x-axis and a dependent variable usually plotted on the y-axis. Because the ball is moving in a horizontal The aim of a lab course in the Advanced Physics Teaching Lab is: • Learn physics by proper preparation for the experiments and by doing. Switch places and have record 15 trials for the other lab partner. scienti c measurement is subject to errors, and the role of the scientist is to understand and quantify them (since you cannot avoid them, learn how to deal with them). • Learn experimental techniques. There is no traditional 'hypothesis - test - analysis' methodology, but just a series of exercises to help you get used to making scientific measurements. Introductory Physics Students' Treatment of Measurement Uncertainty by Duane Lee Deardorff A dissertation submitted to the Graduate Faculty of North Carolina State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Physics Raleigh, NC 2001 Approved by: _____ _____ Another more advanced book : Statistical Methods in Experimental Physics: 2nd Edition by Frederick James) which discuss measurement errors and uncertainties and how statistical methods can be used to obtain best estimates on quantities extracted from measurements. O’Banion Scienin room 307ce Building. doc Page 2 of 2 NOTE: You must complete the data collection above, sign the statement below, and have the teacher initial below prior to leaving the classroom. errors in measurements of temperature due to poor thermal contact between the thermometer and the substance whose temperature is to be found, errors in measurements of solar radiation because trees or buildings shade the radiometer. This activity is an introduction to physics laboratory investigations. 2 depends on the extent to which actual measurement conditions satisfy these assumptions—something that must be determined empirically by plotting the results from a very large number of repeated measurements. In contrast, a measurement of Physics Laboratory Report Sample PHY 223 Lab Report The analysis in the lab manual measurement. You will also get an introduction to measurement errors associated with these measurements. The relevant equation for an idealized simple pendulum is, approximately, 48: Common Sources of Errors in Measurement Systems Dietrich Hofmann Steinbeis Transfer Centre Quality Assurance & Quality Measurement, Jena, Thueringia, Germany 1 Deﬁnition of Errors in Measurement Systems 1 The following is a list of experiments for Physics 2511, University Physics Laboratory I which are performed of the E. 022-62211530. In fact, the term refers to the fact that we cannot make measurements to innnite accuracy and precision and we cannot eliminate them by or in the fundamental physics underlying the experiment. Instrumental errors can occur when the tools are not functioning exactly as they should be. Each section is required to have a heading and should be neat, well A Physics Lab Skills Manual A compilation of laboratory techniques for use in the physics with calculus lab sequence David Newton De Anza College The Physics Department offers a variety of courses including Introductory Physics, Classical Physics, Modern Physics and Elements of Physics (for non-majors). Yellow footnotes are details about experimental procedure or analysis. Sample Lab Instruction Experimental Investigation of C/D. S. A lab write-up for each group is due at the end of the lab session. In physics, as well as other sciences, every measurement comes with some sort of uncertainty. So whenever you have a process in physics that is made up of many independent events which all contribute a little bit to a measurement error, then it will most likely be Gaussian. II. Equipment (per group): Metric ruler 7 How representative of the lawn is the sample area ? Need to take more samples in different areas of the lawn to find the difference between Lab 1: Measurement and Uncertainty I. Implementation at a laboratory is certainly easier if there are those who understand both There are four parts to this lab. Below is an example of an acceptable report. Wright and S. PDF | In science, the worerror' does not mean a mistake. The validity of Eq. INTRODUCTION: Laboratory experiments involve taking measurements of physical quantities. Show all reasoning ME-3 digital device gives no clues for interpolation. If the probability is signiﬂcant for a small range of values, we can say that the measurement is precise. Green River Community College Lab 1 - Page 1 of 7 Lab 1. These can be important subtleties, advanced material, historical asides, hints for questions, etc. Analysis of Experimental Uncertainties: Density Measurement Physics Lab II Objective This laboratory exercise allows students to estimate and analyze experimental uncer-tainties. UNCERTAINTY AND ERROR IN MEASUREMENT Physics is an experimental science. 5 each time. Calculate the uncertainties of all measuring devices you will be using. Use : as an estimate of the best value and F as the first estimate of the uncertainty of your reaction-distanc e. -Vernier caliper is accurate to two decimal places (Vernier scale and main scale)-the Vernier scale has a 0 that moves, we use It to find a measurement to one decimal, by finding two numbers the zero on the Vernier scale lines up between on the main scale (Calculating the standard deviation after the third trial both ways is a check, perhaps of your calculating ability, but also that you are using your calculator or computer properly. That's precision. Croom’s Physics Lab 01-7 Page 1 of 4 Introduction to Graphing and Measurement PART 1 Circumference Analysis [FORMAL LAB] Purpose: You are going to be given 8 cylinders and ask to determine if there is a relationship between the circumference and the diameter of each. A. Measurement Uncertainty JULY 2004 19-3 MARLAP process in the laboratory, including chemical and physical principles as well as practical consid-erations. First rewrite your measurements from . The random uncertainties may be masked by the precision or accuracy of the measurement device. (This number is the first column in your grades. Wherever the zero line of the vernier falls indicates the number in the The average deviation, = 0. In this course you will be expected to master Insert a CD into the foam holder so that the beam reflects off the CD and onto the paper taped to the two wooden stands. UNCERTAINTY IN MEASUREMENT: NOISE AND HOW TO DEAL WITH IT On a full-grown Coast Live Oak there are, by rough estimate, over a million leaves, in general all the same, but in detail, all di erent. (page 3) 2. Brie°y describe the experiment you performed. 2 ERRORS AND UNCERTAINTIES Notes I A. It should be submitted electronically to your TA. 1291/2 Physics Lab Report Format General Remarks: Writing a lab report is the only way your TA will know what you have done during the lab and how well you have understood the process and the results. EXPERIMENTAL ERROR AND DATA ANALYSIS 1. This can be done using the following expressions: single measurement we can't say much about the experimental uncertainty. 2 Propagation of errors and comparison of experimental results Some of the quantities to be determined in this lab will be derived from others which you directly measure. There will be total 10 MCQ in this test. On the left, the digits 8 and 4 are certain because they are shown by markings on the scale. Every measurement that we make in the laboratory has some degree of uncertainty associated with it simply because no measuring device is perfect. Students roll a ball off a table and predict where it will land. You'll measure the periods of 6 pendulums using a stopwatch and see how the uncertainty in the measurement depends on Experiment 1: Errors, Uncertainties and Measurement Laboratory Report Clarisse Cuevas, Leanne Curaming, Aline De Castro, Adrienne De La Cruz, Ida Dy Department of Math and Physics College of Science, University of Santo Tomas España, Manila Philippines Abstract attain satisfactory comparison with a given standard. Embed in the appropriate place in this lab report document the final version of your analysis spreadsheet. No one measurement is any more right or more wrong than another. Putting the required time into reading the lab manual before class will make your lab experience a more enjoyable learning experience. When either randomness or uncertainty modeled by probability theory is attributed to such errors, they are "errors" in the sense in which that term is used in statistics; see errors and residuals in statistics. Data is collected by lab groups but all other work must be the work of the individual student. Rename it as mu_ your Blackboard username _ your course and section number. Write the Sample Calculations. Equipment List 7 How representative of the lawn is the sample area ? Need to take more samples in different areas of the lawn to find the difference between The principle of SDS PAGE-a full and clear explanation of the technique and how does it work - Duration: 13:10. Like ngerprints, no one leaf is exactly like any other. As you may know, most fields in the physical sciences are bifurcated into two branches: theory and experiment . This is due to random errors. Measurement and Uncertainty . The accuracy of a measurement is how close the measurement is to the true value of the quantity being measured -- Cliff Swartz, Physics Today 37(1999), 388. UW Department of Chemistry Lab Lectures Online Chem 142 4 of 9 Figure 2. , LABORATORY 1 WRITEUP - PHYSICS 517/617 Prof. Learn to use all the measuring devices listed above. There are three parts to this lab. Experiment 1: Errors, Uncertainties and Measurement Laboratory Report Clarisse Cuevas, Leanne Curaming, Aline De Castro, Adrienne De La Cruz, Ida Dy Department of Math and Physics College of Science, University of Santo Tomas España, Manila Philippines Abstract attain satisfactory comparison with a given standard. It was revised by J. Every measurement an experimenter makes is uncertain to some degree. The simple pendulum is a favorite introductory exercise because Galileo's experiments on pendulums in the early 1600s are usually regarded as the beginning of experimental physics. This average is generally the best estimate of the "true" value (unless the data set is skewed by one or more outliers which should be examined to determine if they are bad data points that should be omitted from the average or valid measurements that require further investigation). This ﬁrst lab is intended as a gentle introduction to the ideas of measurement and uncertainty. A mountain stream . However, you can still submit a written report, based on one of your lab partners data (clearly state in your report whose data you have analyzed). Figure 1, for example, shows the same measurement made with two different . measurement and error analysis physics lab

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