Note: took this class under remote conditions; hopefully, the reader is taking it in-person :)

TLDR: Gelmini wants everyone to learn and is quite helpful but her exams are freaking impossible.

Professor Gelmini is very enthusiastic and is always looking to help as much as possible. She is also very welcoming to feedback and is always trying to improve. Her office hours are very helpful, as she encourages questions and loves to see people finally understand things. She's very "motherly" and is a warm, wholesome person. One thing Gelmini lacks, however, is the ability to understand how much students actually understand the material. Professor Gelmini thinks we are all experts with the material. If she says an exam is meant to take an hour, it will probably take 3+ hours. Her first midterm was ridiculous, because it was literally find the formula in the notes, do some calculus on it, and get credit. If you didn't find the formula and tried to start with first principles (like the conservation of momentum), you wouldn't be able to solve anything. However, she curved that midterm very gently. And as always, she improved her second midterm (which was 24 hours). Even though I hate taking 24-hour physics exams (it's like 24 hours of torture), I think the questions on her second midterm were much fairer (although, the grading was a bit sus). Her final, however, was on another level. It was 24 hours of pain. I can't believe she gave that final. Worst part about it, the median was way to high. I wonder why.
Anyway, Gelmini is a solid choice. Her exams are super tough, but I think this is the class where I have learned the most physics (so far). Good luck!

The tests are way harder than anything taught in class or given in homework. The class is very disorganized, and the site we used to complete assignments, Kudu, constantly had technical difficulties. The assignments we had to do covered things beyond what was in the lecture yet still didn't prepare us for the tests. She races through the actual content and spends the majority of lectures on Kudu.

Gelmini is not a good lecturer. This class is unnecessarily difficult for what is supposed to be an introduction to physics. Lectures are long and unengaging as she just reads off her notes which are very disorganized and hard to follow. The difficulty gap between homework and tests is laughable, tests are way too hard. She also uses Kudu which is a pain to use. Often the software fails to record answers and scores quizzes incorrectly. Physics is a hard class, but Professor Gelmini makes it especially difficult.

Nothing I can say that people haven't already. Hard to understand in class, has kinda confusing notes, doesn't really know how to use the Kudu platform, and the questions she posts don't match the tests in difficulty. I think she's a sweet person, but the way she teaches makes it unnecessarily harder to understand the content. I thought the mandatory participation was nice just because it keeps you from blowing off what is otherwise a decently hard class, but if you take this class with her just know you're going to be sinking a lot of additional time outside of class trying to teach yourself the content.

Professor Gelmini is kind of like the Professor Kavner (chem) of physics: incredibly kind person, but has a teaching style that lacks clarity. I'm not naturally gifted in physics, but I've never felt this confused (took some physics in high school). It genuinely felt like I was unlearning the material I had learned in high school at some points. Her grading style is also pretty difficult to deal with, since she has incredibly hard tests that she then curves, but that doesn't let you know at all if you're doing well in her class or not.
One great thing about the class is that she posts notes, and she posts them in advance to the lectures, but they are pretty difficult to understand. The fact that she requires participation is also really annoying since you don't come out of the lectures feeling like it was a good use of your time.
If you're good at physics, you'll probably do well, but unfortunately that probably isn't thanks to her lectures, but rather your own work. Would not recommend.

Professor Gelmini is a terrible lecturer. She just reads off of her notes for the whole two hours of class and it seems like a waste of time to go since it takes less time if I just read them. She uses a website called kudu for homework assignments which is also extremely disorganized and due dates are never clear and/or change frequently. Don't even get me started on the tests. I did 60 pages worth of practice problems and spent on average 6 hours a day studying (so much that I had to sacrifice time for my other classes) and I still did awful on both midterms. The problems are extremely difficult (more than anything on the homework or in discussion) and the amount of time allotted is not enough to do them. 10/10 would not recommend.

Unfortunately a bad class.
The topics in this class are absolutely fundamental for physics (it is the basis (pun intended) for every mathematical operation in the realm of physics).

She is quite a yeller, thick accent, comes off fairly abrasive.

I couldn't handle it and dropped. Seems like people who stuck it out came out well.

Received very good grades on the homework but it just didn't translate to the exams. She drops one of the two midterms which can be really great and they should be fairly straight forward if you know your stuff through and through.

If you can self study you will do well but if you actually need the professor to teach you, I would wait out a different professor instead.

Professor Gelmini is very energetic and passionate about the content she is teaching. However, sometimes she doesn't understand the student's question well so her interpretation will be slightly different from what you want to know. Also, sometimes the contents on the class are not well organized such that the flow is not very clear, so I have to read the textbook later to make sure I know why it is this way.
The grade consists of two parts: Homework and a group presentation about a topic involving GR (chosen from a given list). In general, people get good grades on the presentation and the written report as long as they don't make too much mistakes. So, the homework is very important: there are 5 of them each with about 4 problems. Problems are self-made so you'd better ask the TA for help. Don't worry because there are many OHs available in a week. Thanks our TA Joel, he's super helpful!!

I took 1A with Gelmini last spring quarter. I really like her since she is really funny during class with her accent(but you can understand what she is talking about). But her homework can be a pain in the ass since it takes you a lot of time but almost worth nothing (10%), both of her midterms are ridiculously easy and the curve is really high. That is to say, her final is quite challenging so make sure you really understand the materials. Overall, I would recommen this professor.

Professor Gelmini is very enthusiastic about making sure her students walk away from the class having learned something. Her tests are extremely difficult, especially in comparison to the rather straightforward homework she assigns, and I failed my first midterm, but she was more than willing to offer redemption, and to factor the weight of that midterm into my final grade, once I went and spoke with her at her office hours. She is very approachable, and is a very good *teacher* one-on-one during her office hours (I emphasize teacher because she does not merely give out answers, but expects you to work for them), although I would not recommend conversing with her via email, as she got backlogged very early into the quarter, and tended to need several reminders to get her to respond as the quarter progressed. If she teaches 1A again with the honors section, I highly recommend that any student, whether or not they are in the Honors Program, take the class, as it was a very enjoyable, and rather easy supplement to the course. Difficult tests notwithstanding, she is a very likable and great professor.