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## Physics Blogs

Hello, my name is Aaron.Zhang. I was born and raised in north of China. However, wonderful Miami is my home now. Now I am studying in Florid International University ( FIU ) for my master degree. I love Miami's sunshine, beach and enthusiastic people.No wonder more and more Mandarin speaking tourists, investors and students are visiting here. Experience and background: I graduated in Chongqing University of China in 2013, and then worked in New Oriental in Beijing, a listed education company, as a senior BD staff. My major in university is Marine Engineering. When I was an undergraduate, I tutored K-12 students for physics, math, swimming ,English and Chinese history. Besides, I also tutored Mandarin and make friends with students from all over the world through my university's international student club. Now I tutored Mandarin Chinese, Chinese history and international relationship , Swimming and Physics. Mandarin : My Mandarin pronunciation is... read more

I am a High School Science Teacher and we deal with a lot of word problems that contain many variables that could fit into many different equations. Here is how I break down the content step by step for my students.      Physics Problem A box is accelerating across a frictionless surface. It is being pushed with 75 newtons of force and the has a mass of 10 kilograms. What is the magnitude of the box's acceleration?   1) You want to identify and label all variables presented to you in the problem.      Ex: F = 75 N, m = 10 kg   2) Identify and Label the Variable the question is asking you to find.      Ex: a = ?   3) List possible known equations that have the variable you need to solve for.      Ex: a = v/t            F = ma   4) Choose the equation that has variables that are known from the problem.  ... read more

Labs associated with the pre-med sciences are also required, and the difficulty of these labs varies depending on which school you go to.  The most frequent lament by college students is that their labs and lab reports command an unreasonably large chunk of their time, despite being only worth 1 credit.  Most college courses are 3 credits, meaning they meet for three hours of class per week; but labs, usually take anywhere from 3-6 hours per week, and ultimately do not carry much weight in terms of your overall grade in being just one credit.  You would think that the work required to succeed in labs is adjusted proportionally, but it's not. Most labs have weekly reports and a final paper/project at the end of the semester, right before finals begin.  Last year, I spent every Sunday just working on weekly physics lab reports.  I did well, but consistently lost a full day that I could have used towards other work.  That's the dilemma, though.  You... read more

When is it a good time to look for a tutor?  Some students wait until a big exam comes up, and do lots of cramming at the last minute.  While that strategy may work for some, others may need to take a different approach.    What if you need to take a mathematics or physics course and you know you will have difficulties?  Maybe the course is really advanced or it is not one of your best subjects.  The best approach would be to work with a tutor on a regular basis throughout the semester.  They can help you with any misunderstandings that may come up along the way, and help prevent you from falling behind in the course.  This also ensures that you get the individual attention that you may need.

As very little, we were told that earth has gravity, and we are not flying away from the earth because the gravitational force holds us from flying away. The gravitational force is defined as Fg= GMm/(r^2). You might have learned this formula in a non-calculus based general physics class. Also, you might have learned the other formula relating to gravitational potential energy. The gravitational potential energy is given as U=-GMm/r. How exactly is the gravitational potential energy related to the gravitational force formula. The following is the mathematical derivation for gravitational potential energy from gravitational force.   Assumption: we move an object away from the center of earth, and we define the U=0 when r=infinity  dU=-dW=-Fdr*cos(theta)  du= -Fgdr*cos(theta)   since we are simply moving the object away from the earth's center theta=180 degrees, the angle between gravitational force and the dr   du=Fgds Uf-Ui=Int(ri... read more

Hi Everyone! As the school year kicks into full swing, its important to monitor your child's progress. Some schools are great at doing this, and some... not so much. It is up to you as parents (or students!) to take control of your student's education and make sure they are at least on track, but hopefully excelling. That's all for now, take care!

I recommend Wolfram Alpha to all of my math and physics students, and to many others. It calls itself a Computational Knowledge Engine which doesn't do too good a job of describing itself but it is very useful as i'll explain below. It does quite a number of things that aren't comparable to other search engines. Wolfram Alpha First, one of its central components is based on Mathematica which is a mathematical programming language. Because of this it can solve problems in algebra, geometry, calculus, statistics, matrices and many other subjects. This is largely what I use it for; as in if I want to quickly solve or check a problem. If i can't remember exactly what the half angle integration of tangent is, or if a problem results in an answer to large for my calculator to display.   Second, it has large data sets available to it. These vary from current and historical weather data, i.e. what is the current temperature/chance of rain and what was the temperature... read more

Hi there and welcome to my blog! This is my first post, with hopefully many to follow.   In my undergraduate years, I learned about a very curious summation discovered by the great Ramanujan. Since then, whenever a student tells me that they hate mathematics and that it is stupid, I show this to them and they almost always see math in a new and enthusiastic light. Here, I will explain the series to you, and hope that it brings you as much excitement and curiousity as it first brought me.   Consider the series 1+2+3+4+5+6+... The series is simple, we simply add two to one, then add three, then four, then 5, and keep going forever. The series is called a "monotonic series", meaning that it is ever increasing. This should be intuitive, since if we look at the first few terms, we have   1 = 1 1 + 2 = 3 1 + 2 + 3 = 6 1 + 2 + 3 + 4 = 10   If we continue the process,... read more

In recent months, I’ve felt the need, as one who has made a study of the laws of physics, to educate the general public and dispel myths that abound in society today. Today, I’d like to talk about fans. This is a topic of great personal significance to me in that, growing up, my parents wouldn’t turn the air conditioning on unless the temperature inside the house got up into the 80’s (about 27-29 Celsius). Instead, we were told to just turn the fan on. Knowing what I know now, I can say that that wasn’t the best of ideas. To find out why I say that, let’s look at a fan from the standpoint of thermodynamics*. When you turn a fan on, you bring in a steady flow of energy into whatever room the fan occupies. Friction guarantees that, given enough time, all of this energy will be turned into heat. What this means is that, unless the energy is allowed to escape, then it will just continue to build up, heating the room. The good news is that the electrical energy brought into... read more

Displacement is the distance between the starting position and final position. It is the change in position. This might seem easy enough but one thing about displacement is that it is the net change in position. Meaning it doesn't matter the path you took, all that matters are the initial and final locations. So if you ran around a jogging track, and ended in the same place you started, your displacement would be 0.   Velocity tells us how fast an object is moving. It is described as the displacement divided by time. Going back to the track example, since your displacement is 0 in this situation, the average velocity would be zero. This is because velocity is a vector. It has both magnitude and direction. Take the direction away and you only have magnitude, in this scenario that gives us speed. Speed is different that velocity in that it is a scalar, it has no direction, only magnitude.

Two types of studies that many people despise the most are Science and Mathematics.  Some people cannot even stand to hear them mentioned.  Truth is, whatever you are actually extremely good at, others may need some improvement.  Although there are scientists and mathematicians out there who are able to analyze and engineer scary and complex looking graphs and three-dimensional shapes and models, they do have some weaknesses.  One of my weaknesses in academia is reading (especially when it is uninteresting to me).  I have struggled with reading for quite some time and there are times where I actually have to force myself to read, not because I can't do it, because I can.  This is the same for many others, it's not that you do not like math/science, its just you were taught to memorize it and not understand it.  Back when you did adding and subtracting, math was pretty fun right?  Well I am sure you will find science and more complex... read more

1. Hyperphysics This website is basically a concept map of every physics topic, and I mean every. It's not a comprehensive guide to all of them, but it provides a basic overview of pretty much everything you could ever want to know about physics. It's not a "Physics for Dummies" site, so if you're struggling, you'll still need a competent tutor. That being said, if you want to look up and equation or definition, or just learn a little more about something your teacher only mentioned, it is the best resource I know.   2. Paul's Online Math Notes This website offers extremely detailed lessons on Algebra, Calculus I, II, and III, and Differential Equations. To be honest, I learned most of what I know about Calculus through Paul, not my professors. I'll even admit that many students can use this in place of a tutor. Paul's teaching style isn't for everyone, though, so many people will still need some extra help.   3. SparkNotes... read more

Hi All:)   My favorite resources found online vary greatly, in regards to which subject help is needed in. For math intermediate level and down, math-drills.com and mathfactcafe.com can be very useful. Although I don't tutor in Physics currently, physicsclassroom.com is a good online resource to help a student get kind of warmed up before learning a new lesson. For any elementary topics, greatschools.org/worksheets/elementary-school/ is a good resource. All of these are free and easily found. Also, simply typing in your subject of interest followed by practice problems, can guide to a large exploration of online help 24/7.

Part of studying mathematics is accepting that we do not know all there is to know.  Its possible, daily even, for our understanding of reality to be challenged or even changed.  Think of how different our idea of the universe was 100 years ago.  Think of how different it could be in 100 years, even! http://www.space.com/24418-stephen-hawking-no-black-holes.html

Rigor is something that is emphasized frequently in higher levels of mathematics and physics, and it has always been something that I appreciated. Unfortunately, with increased rigor often comes a decreased number of people who can understand an argument. One pedagogical ploy that has been used to great effect has been to offer "proofs" of rather difficult concepts on the basis of certain tricks that are not themselves rigorous. I call these things "lazy proofs", and they suffer from the problem of leading to outright contradictions and nonsense if taken to far. This kind of problem, usually, is swept under the rug by the person (usually a teacher) offering the proof in hopes that the misconceptions that could arise never rear their ugly head. Sometimes they never do. Other times, they cause problems down the road. One example of such a lazy proof is the following argument that the centripetal acceleration is   a = v2/r.  ... read more

This blog post will discuss some of the physics behind the things molecules do – as gases, liquids, or solids – and also get you thinking about the concepts momentum, kinetic energy, rate (of a physical molecular-scale process), and equilibrium constant (of a physical molecular-scale process). These may all sound like difficult, high-level ideas – but if molecules, which don’t have much in the line of brains, can act according to these ideas, you, with brains, can follow them too! What are molecules? First, at their simplest, they’re just clusters of atoms stuck together in such a way that they don’t come apart on their own. (If they did, they would do so immediately; there’s no such thing as delayed disintegration, the way that isotopes of some elements are radioactive.) Wait a minute, you say, what if I heat a pure substance and it breaks down? That happens when one molecule of the substance crashes into another molecule of the substance with enough energy to break at least... read more

Greetings Students!   Please check out my tutoring policies here: Gerrit's Tutoring Policies    (It's very important that you read those!)     Here are some useful resources for help with physics problems:   Guide to solving problems. Here is a helpful guide I created to illustrate from start to finish all of the steps involved to properly go about solving a physics problem. It outlines a tried-and-true proven method for approaching physics problems that is thorough, structured, simple, and (most importantly) breaks down problems making them much easier to solve. Please adopt it, practice using it, and try to incorporate it into all of your future physics assignments; it will make your life easier. Steps to Solving Physics Problems   Comprehensive lists of high-school physics equations: Official AP Physics Exam: Equations List MCAT Physics Equations with Explanations Extensive... read more

Here are some of my favorite Science resources. Check back again soon, this list is always growing! I also recommend school textbooks, your local library, and used bookstores.   (Gr. 9-12) CellsAlive.com – Learn about the life cycle of a cell, including reproduction, structure and live cell growth videos. (Gr. 9-12) Zooniverse.com – A fabulous resource for science projects; you can even participate in someone else’s live science project (some are even from NASA). Focuses on astronomy, biology, and chemistry. (Biology) KhanAcademy.org/science/biology – Tutorials and information on all things Biology related (Biology) SpellingCity.com/biology.html – Provides a list of vocabulary terms typically seen in Biology courses   (Biology) Biology-online.org - Provides quick explanations of concepts, with examples (Bio/Anat/Physics) BiologyCorner.com – Lessons, tutorials, definitions, and practice problems.

Now that finals have passed for most of the college students on the semester schedule, I'd like to reflect on the panic that arises when students in required introductory physical science classes come to the end of a course and realize that they haven't retained anything! What is the correct approach to triaging such situations? Of course, the best way to engage with material is by answering questions that are similar to those that will be on the examination, and most professors will be kind enough to tell you what the format and types of questions will be. Generally, there are two types of questions you will find: qualitative and quantitative. I'll deal with the best way to study for each type of question in turn.   Qualitative Questions The tendency here is to think that cramming and memorizing facts is the best way to go to answer such multiple choice, free response, or essay questions on qualitative subjects. However, this is not often the case.... read more