The STP TemperatureMeasurementLJ program simulates the exchange energy between a demon and a system of particles interacting via the Lennard-Jones potential. The program shows the kinetic temperature of the system as a function of time, and the energy distribution of the demon. The purpose of...

The Point Charge Forces in Two-Dimensions model investigates the electric force that a charged particle experiences in a two-dimensional situation, because of four other nearby charged particles. The net electric force is shown as an arrow attached to the particle. Note that each particle can be...

The Ejs Duffing Attractor model computes the solutions to the non-linear Duffing equation, which reads, x'' + 2?zN* x' - x (1 - x2) = f cos(?Ya* t), where each prime denotes a time derivative. The simulation displays a three-dimensional plot of phase space versus angle and three Poincare plots...


Platforms: Mac, Mac OSX

Keyword: Archive, Attractor, Clicking, Compiled, Created, Distributed, Double, Duffing, Ejs Ehu Chaos Duffing Attractorjar, Installed, Model, Models, Modify, Nonlinear, Physics, Popup, Simulation, Simulations, Source

The Ejs Damped Driven Simple Harmonic Oscillator model displays the dynamics of a ball attached to an ideal spring with a damping force and a sinusoidal driving force. The spring is initially unstretched and the ball has zero initial velocity. The initial position of the ball can be changed by...


Platforms: Mac, Mac OSX

Keyword: Archive, Compiled, Damped, Driven, Ejs Osc Shodrivenjar, Force, Harmonic, Initial, Installed, Model, Models, Modify, Oscillator, Physics, Program, Readytorun, Simple, Simulation, Source, Spring

A STRIPS problem is a planning problem that views the world as a set of variables and actions upon them. A problem is solved when a series of actions can be found that will lead to a Goal assignment of values to variables from a Start assignment. The STRIPS to CSP converter allows for the...


Platforms: Mac, Mac OSX

Keyword: Actions, Assignment, Conversion, Converter, Creation, Found, Graphical, Planning, Problem, Series, Solved, Solving, Start, Strips, Values, Variables, Views, World

Build a gene network! The lac operon is a set of genes which are responsible for the metabolism of lactose in some bacterial cells. Explore the effects of mutations within the lac operon by adding or removing genes from the DNA. Sample Learning Goals: * Predict the effects on lactose...


Platforms: Mac, Mac OS X v10.4

Keyword: Added, Changed, Concentration, Control, Dnasample, Elements, Explain, Genes, Goals, Learning, Metabolism, Mutated, Predict, Regulation, Removed, Removing, Responsible, Roles

The EJS Falling Loop Model shows a conducting loop falling out of a region of uniform magnetic field. It plots the velocity of the loop as a function of time. Users can change the size and orientation of the loop as well as the extent and location of the uniform field. If Ejs is installed,...


Platforms: Mac, Mac OSX

Keyword: Additional, Archive, Clicking, Compiled, Designed, Distributed, Double, Ejs Fallingloopjar, Falling, Field, Found, Installed, Modeling, Models, Physics, Program, Readytorun, Source, Uniform

The GR Kerr Exploding program simulates orbits of objects released in an explosion in the equatorial plane of a rotating black hole using the Kerr metric. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the gr_kerr_exploding.jar file will run the program if Java is...


Platforms: Mac, Mac OSX

Keyword: Angular, Aspects, Blackhole, Compadre, Exploding, Explosion, Found, General, Momentum, Origin, Parameter, Physics, Program, Programs, Relativity, Searching, Source, Suite, Visualizations

The EJS Ideal Gas Expansion model simulates a two-dimensional ideal gas in a square box. This simulation can be used as part of the activity described in "The Statistical Interpretation of Entropy: An Activity" by Todd Timberlake, to be published in The Physics Teacher. In the model, the...


Platforms: Mac, Mac OSX

Keyword: Compiled, Distributed, Expansion, Ideal, Installed, Model, Modeling, Models, Modify, Number, Particles, Physics, Popup, Quotopen, Random, Readytorun, Selecting, Simulation, Simulations, Source

The Point Charge Electric Field in 1D model investigates the electric field at various positions along a line, when there are either one or two charged particles on that line. The electric field is represented in two ways. First, there is a movable positive test charge that you can move along the...


Platforms: Mac, Mac OSX

Keyword: Charge, Chargethe, Define, Direction, Electric, Field, Force, Function, Graph, Locations, Negative, Pointing, Position, Positive, Represent