PHYSICS LAB REPORTS Use the following as a guide to writing your lab reports. Note: If you are absent on the day of an experiment, you must come in before or after school to do the experiment. Lab reports cannot be accepted from anyone who has not performed the experiment. Failure to submit a report will result in no credit for the experiment. Heading:
Purpose:
Give a meaningful title to your report. Do not just write “Physics Lab Report” as a title. A more appropriate one includes a brief description of the purpose or topic you are investigating. Example: “Determining the Acceleration Due to Gravity Using a Pendulum”. Be sure to include your name, the names of your partners and the date performed at the top of the lab report. State the purpose of the experiment (the reason you are performing this experiment).
Apparatus: List the materials used in the experiment. If applicable draw a neat 2-D diagram with a pencil and a ruler to show the setup of the apparatus. Label the diagram in ink. Optional: diagrams may be computer-generated. Method:
The method should describe what you did with the apparatus and any measurements you made. The method should enable anyone who did not do the experiment to understand the procedure. The method or procedure that was carried out should be written in the past tense, passive voice. For example: "The length of the string was measured" is correct. "I measured the length of the string" OR "Measure the length of the string" is incorrect. Write the procedure as a list of numbered steps.
Observations and Analysis: Measurements should be neatly recorded at the time of the experiment including the correct units. In your report the measurements should be repeated in a neatly drawn chart with correct headings. For example: Period (s) 4.10 3.85 3.28 2.21 1.38
Length (m) 4.30 3.60 2.50 1.20 0.50
Units should be included with the headings of your chart. Do not split a chart over two pages
Show a sample of any calculations that you did in your analysis of the data. If possible, use the computer program ‘Graphical Analysis’ to analyze data. (If graphing by hand, use precise metric graph paper and show your slope calculation.) From the data analysis be sure to indicate any resulting equations, constants, or percent error calculations. Discussion:
If an 'accepted' or 'true' value of a constant is known, then compare your result to that value by finding a percent error. If you are comparing two experimentally determined values, use a percent difference calculation. Discuss the sources of error in this section of the report.
Conclusion:
Briefly present the results of your experiment with the percent error. The conclusion should directly relate to the purpose. Any proportionality determined from the experiment should be stated in sentence form: however, a resulting equation may be given in terms of symbols and the equation. If the proportionality constant represents a physical quantity be sure to indicate this and include the percent error.
For example: “This experiment demonstrated that the period of a pendulum was directly proportional to the square root of ⁄√ . This its length ( T l ) and the equation relating the proportion was T k l where 2 gave an experimental value for the acceleration due to gravity on the earth of 9.78 m/s which gave a 1.01 % 2 error when compared with the accepted value of 9.80 m/s .”
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