Table of Contents


Labs for PHYS 121/122/123 and PHYS 131/132/133

 A ball bearing in the process of impacting sand and creating a crater

Overview


Your first in-person meeting will occur during Week 3. Full details on how the course will run are below, but in short the format is as follows:

Our goal with this lab sequence is for you to gain practice doing experimental physics. While you will see many of the phenomena discussed in lecture show up in these labs, the point is not just to repeat that content but to use that content to explore and learn the scientific process. Put succinctly, the goal is to understand how we know, not what we know.

Lab schedule


Autumn Quarter: PHYS 121/131

Your first in-person lab meeting will occur during Week 3.

In the meantime, you have an important preparatory assignment (Introduction to Experimental Physics) to complete before the end of Week 2. When you are finished, upload your assignment to Canvas by Friday, October 10 at 5:30 pm CDT to receive credit.

Week Days PHYS 121/131 Experiment
1 Sept 29-Oct 3 NO LAB
2 Oct 6-Oct 10 Introduction to Experimental Physics (No In-Person Meeting)
3 Oct 13-Oct 17 The Period of a Pendulum (Part 1)
4 Oct 20-Oct 24 The Period of a Pendulum (Part 2)
5 Oct 27-Oct 31 Cratering (Part 1)
6 Nov 3-Nov 7 Cratering (Part 2)
7 Nov 10-Nov 14 Simple Harmonic Motion and Mechanical Resonance (Part 1)
8 Nov 17-Nov 21 Simple Harmonic Motion and Mechanical Resonance (Part 2)
- Nov 24-Nov 28 NO LAB / Thanksgiving break
9 Dec 1-Dec 5 NO LAB
Winter Quarter: PHYS 122/132

Your first in-person lab meeting will occur during Week 3.

Week Days PHYS 122/132 Experiment
1 Jan 6 - Jan 10 NO LAB
2 Jan 13 - Jan 17 NO LAB
3 Jan 20 - Jan 24 Electric Fields I: Field Mapping
(except Monday labs on MLK day)
4 Jan 27 - Jan 31 Electric Fields II: Acceleration and Deflection of Electrons
5 Feb 3 - Feb 7 Circuits I: Electrical Measurements
6 Feb 10 - Feb 14 Circuits II: Capacitance
7 Feb 17 - Feb 21 Magnetic Fields I: $e/m$ of Electrons
8 Feb 24 - Feb 28 Magnetic Fields II: Field Measurements and Resonance
9 Mar 3 - Mar 7 NO LAB
(except Monday makeup for Electric Fields I: Field Mapping)
Spring Quarter: PHYS 123/133

Your first in-person lab meeting will occur during Week 3.

Week Days PHYS 123/133 Experiment
1 Mar 24-Mar 28 NO LAB
2 Mar 31-Apr 4 NO LAB
3 Apr 7-Apr 11 Wave Motion and Sound
4 Apr 14-Apr 18 Interference
5 Apr 21-Apr 25 Diffraction
6 Apr 28-May 2 Geometrical Optics
7 May 5-May 9 Polarization
8 May 12-May 16 PHYS 123: Radioactivity
PHYS 133: Heat and Temperature
9 May 19-May 23 NO LAB

Lab group assignment


When you registered for the course, you were placed into a 2 hour and 50 minute lab section by the Registrar.

It is essential that you are in an appropriate lab section by Friday of Week 2. Contact Tiffany Kurns (tkurns@uchicago.edu) with all lab section scheduling requests.

What to do if you are sick or miss lab


If you miss a lab (due to sickness or emergency), please contact both your lab TA and Tiffany Kurns (tkurns@uchicago.edu) as soon as possible. Tiffany will work with you to find a different lab section to attend later in the week (if one is available and you are able). If you are unable to attend an alternate section during the same week as your absence, you will need to coordinate with your lab TA and lecture instructor to discuss makeup options.

Lab format


Goals

For the introductory physics laboratories here at the University of Chicago, we have adopted a set of learning objectives. By the end of this lab sequence, you should be able to do the following:

Put succinctly, the goal is to understand how we know, not what we know.*

* These goals were first outlined by the Physics Education Research Lab at Cornell University for labs at all levels, but especially for introductory labs. You can read more about the philosophy behind these learning goals  here.)

Each lab you work on this year will relate back to one or more of these course objectives and will help you develop and apply the tools of experimental physics. The aim is to teach critical thinking through experimentation, and for you to see how the concepts of lecture are applied (and limited by) specific physical situations.

Lab "projects"

Grading

The rubric for the every project this quarter is identical and is shown below. Your work in-lab (e.g. your completed lab notebook and participation in group meetings) is worth 4 points and your out-of-lab report (e.g. answers to questions and/or summary and conclusions) is worth 4 points.

Complete (2 points) Needs improvement (1 point) Not acceptable (0 points)
Lab Notebook (Group) Submits a lab notebook at the end of the meeting that shows reasonably complete notes and data for all the tasks assigned for that session. Submits a partial lab notebook with important details missing, or submits a notebook that lacks care and is rushed. Does not submit a lab notebook, submits a lab notebook that is missing significant sections, or submits a lab notebook after the meeting has ended.
Participation (Individual) Comes to the lab on-time and prepared, and stays until the group is completely finished.

Is an active participant in the experiment, but also shares responsibilities and makes sure that all partners get a chance to contribute as well.

Answers TA and group questions, and participates in a meaningful way during discussions.
Either arrives late or leaves early, or otherwise comes to lab unprepared.

Is either reluctant to participate in the experiment or overly dominant in a way that makes it difficult for partners to participate.

Is unable to answer TA and group questions, or does not participate in discussions.
Misses most or all the session, or is “not present” (i.e. doing something else) during the period.

Is disruptive or disrespectful to the group or to partners, or has an attitude that makes it difficult for the class or group to make progress.
Complete (4 points) Needs improvement (2 points) Not acceptable (0 points)
Report (Individual) Answers questions thoughtfully and completely.

Clearly presents important data in tables and graphs, and appropriately labels and describes these data (including units and use of appropriate significant figures).

Includes correct units and appropriate number of significant figures on all calculated values.

Makes conclusions that are complete, and clearly supported by the data. Compares data to models or predictions (where appropriate) and include uncertainties in that discussion (if applicable).
Attempts questions, but does not support answers fully or correctly.

Does not present data appropriately, does not include units on values, or does not keep appropriate significant figures.

Is unclear or makes major mistakes in reporting or summarizing work.

Makes conclusions which are mostly correct, but which miss minor points.

Does not use data as effectively as possible to support conclusions.
Does not answer meaningfully.

Presents no data or plots (where appropriate), or presents data in a confusing manner.

Provides incorrect units or makes fundamental flaws in calculations that render the answer meaningless.

Makes conclusions that are directly contradicted by the data, overstates conclusions beyond what the data support, or is unclear in how conclusions are derived.

Uses unsupported speculation to explain discrepancies in their data rather than well-reasoned arguments.

Guidance for writing your summary and conclusions

After your experiment has finished, you will need to write up your summary and your conclusions. This should be a separate document, and it should be done individually (though you may talk your group members or ask questions). Include any data tables, plots, etc. from the your lab notebook as necessary in order to show how your data support your conclusions.

The summary is just a retelling of the facts. What were the important things you did? How did you make measurements? What changed as you worked through the project? What are the take-away results?

The conclusion is your interpretation and discussion of your data. What do your data tell you? How do you data match the model (or models) you were comparing against, or to your expectations in general? (Sometimes this means using the $t^{\prime}$ test, but other times it means making qualitative comparisons.) Were you able to estimate uncertainties well, or do you see room to make changes or improvements in the technique? Do your results lead to new questions? Can you think of other ways to extend or improve the experiment?

Each of these above sections does not need to be long; one or two paragraphs for the summary and another one or two paragraphs of conclusion should be sufficient. What is important, however, is that your writing should be complete and meaningful. Address both the qualitative and quantitative aspects of the experiment, and make sure you cover all the “take-away” topics in enough depth.

Don't include throw-away statements like “Looks good” or “Agrees pretty well.” Instead, try to be precise, state your facts clearly and honestly, and don't overreach or stretch your conclusions beyond what the data tell you.

Feedback


The instructional laboratory staff is always interested in feedback. Let us know if you find typos or mistakes, or let us know if you have comments about what you like or don't like about the lab experience.

Do not use this form for the end-of-quarter TA feedback. Use the form linked on the experiment page of the last experiment of the quarter in your course.

Please use our Online Feedback Form to leave anonymous (or non-anonymous) comments.