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Revision as of 01:58, 2 December 2017

Georgia Tech Student Wiki for Introductory Physics.

This resource was created so that students can contribute and curate content to help those with limited or no access to a textbook. When reading this website, please correct any errors you may come across. If you read something that isn't clear, please consider revising it for future students!

Looking to make a contribution?

  1. Pick one of the topics from intro physics listed below
  2. Add content to that topic or improve the quality of what is already there.
  3. Need to make a new topic? Edit this page and add it to the list under the appropriate category. Then copy and paste the default Template into your new page and start editing.

Please remember that this is not a textbook and you are not limited to expressing your ideas with only text and equations. Whenever possible embed: pictures, videos, diagrams, simulations, computational models (e.g. Glowscript), and whatever content you think makes learning physics easier for other students.

Source Material

All of the content added to this resource must be in the public domain or similar free resource. If you are unsure about a source, contact the original author for permission. That said, there is a surprisingly large amount of introductory physics content scattered across the web. Here is an incomplete list of intro physics resources (please update as needed).

  • A physics resource written by experts for an expert audience Physics Portal
  • A wiki written for students by a physics expert MSU Physics Wiki
  • A wiki book on modern physics Modern Physics Wiki
  • The MIT open courseware for intro physics MITOCW Wiki
  • An online concept map of intro physics HyperPhysics
  • Interactive physics simulations PhET
  • OpenStax intro physics textbooks: Vol1, Vol2, Vol3
  • The Open Source Physics project is a collection of online physics resources OSP
  • A resource guide compiled by the AAPT for educators ComPADRE
  • The Feynman lectures on physics are free to read Feynman

Resources


Physics 1

Week 1

Help with VPython

Vectors and Units

Vectors and Units

Week 2

Week 3

Analytic Prediction with a Constant Force

Week 4

Week 5

Conservation of Momentum

Week 6

Week 7

Week 8

Work by Non-Constant Forces

Week 9

Week 10

Choice of System

Rotational and Vibrational Energy

Week 11

Different Models of a System

Models of Friction

Week 12

Week 13

Week 14

Week 15

Physics 2

Week 1

Electric force

Electric field of a point particle

Week 2

Week 3

Week 4

Field of a charged rod

Field of a charged ring/disk/capacitor

Week 5

Potential energy

Sign of a potential difference

Week 6

Electric field and potential in an insulator

Moving charges in a magnetic field

Moving charges, electron current, and conventional current

Week 7

Magnetic field of a wire

Magnetic field of a current-carrying loop

Magnetic field of a Charged Disk

Atomic structure of magnets

Week 8

Steady state current

Node rule


The Main Idea

  • Mathematical Model
    • In this image, you can see what our equations are based on: File:Noderule.jpg
    • The node rules can be written as I_total = I_1 + I_2 and I_total = I_3 + I_4. It is also true that I_1 + I_2 = I_3 + I_4.
    • However, each of these currents are different because each point has a different resistance. The current is different for each because it is equal to V/R, and in a parallel circuit, the voltage drop across each point is equal.
    • An easy way to know when to use node rule is by seeing if there are three connections or more. That is when node rule is most helpful.
  • Computational Model
    • In an electric circuit in series, electrons flow from the negative end of a power source, creating a constant current. This current remains consistent at each point in the circuit in series. Sometimes, a circuit is not simply one constant path and may include parts that are in parallel, where the current must travel down two paths such as this:
    • File:Noderule.jpg
    • In this case, when the current enters a portion of the circuit where the items are in parallel, the total amount of current in must equal the total amount of current out. Therefore, the currents in each branch of the parallel portion must sum up to the amount of current at any other point in series in the circuit.
    • People also call this the "Junction Rule"
    • Another important point is that this comes from the Kirchoff's Circuit Laws

Examples

  • Simple
    • Here is an example of a simple circuit problem:
  • Medium
    • Here is an example of a medium circuit problem:
  • Difficult
    • Here is an example of a difficult circuit problem:

Connectedness

  • To other topics:
    • Many times when you use Node Rule you will also use the Loop Rule. The Loop Rule states that the sum of voltage will equal zero. So using this concept and the Node Rule, you are usually able to figure out missing variables in circuit problems.
  • To majors:
    • Node rule is important in all and any major. More specifically, electrical engineering because of the constant need to look, analyze, and understand circuits. However, in general, any major that involves some sort of circuitry will need this. It is the basis to making an effective circuit.
  • To industrial application:
    • If you go into robots, engineering, or really anything that involves wires and batteries. You will need to know this.

History

  • Basic History
    • Gustav Kirchoff was the man who discovered this rule while studying electrical currents. He was also the first person to confirm an electrical impulse moves at the speed of light.

External Resources and Information

  • Sources like Khan Academy and simple YouTube searches can be very helpful in learning more about this topic.


Electric fields and energy in circuits

Week 9

Electric field and potential in circuits with capacitors

Week 10

Magnetic force

Week 12

Week 13

Semiconductors

Week 14

Circuits revisited

Week 15

Electromagnetic Radiation

Sparks in the air

Physics 3

Week 1

Classical Physics

Week 2

Week 3

Week 4

Matter Waves

Week 5

Week 6

Week 7

The Hydrogen Atom

Week 8

Week 9

Molecules

Week 10

Statistical Physics

Week 11

Condensed Matter Physics

Week 12

The Nucleus

Week 13

Week 14