The Bell Jar Summary
The Ejs Lagrange Top model displays the motion of a heavy symmetric top under the effect of gravity. The top has an initial angular speed that provides the precessional, nutational, and rotational speeds. The ratio of Lz to Lx can be set via slider and the initial angular position and angular...
Platforms: Mac
License: Freeware | Size: 10.24 KB | Download (38): Lagrange Top Model Download |
The Two Dimensional Schrodinger Equation model simulates the time evolution of a two-dimensional wave packet as it moves towards a slit with an obstacle in it, both with variable widths. By changing three parameters via sliders provided, slit width, obstacle width, and initial position of the...
Platforms: Mac
License: Freeware | Size: 71.68 KB | Download (40): Two Dimensional Schrodinger Equation Download |
The QM Measurement program displays the time evolution of the position-space wave function and can be used to simulate the quantum-mechanical measurements of energy, position, and/or momentum. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the qm_measurement.jar file...
Platforms: Mac
License: Freeware | Size: 716.8 KB | Download (40): QM Measurement Download |
The Simultaneity Spacetime Diagram model uses light-trajectories to show the effect of relative motion when observing (recording) events in special relativity. In the default scenario, an explosion (an event) at the center of a right-moving stick occurs at t=0 and the arrival of the explosion...
Platforms: Mac
License: Freeware | Size: 755.71 KB | Download (36): Simultaneity Spacetime Diagram Model Download |
The EJS Molecular Dynamics model is constructed using the Lennard-Jones potential truncated at a distance of 3 molecular diameters. The motion of the molecules is governed by Newton's laws, approximated using the Verlet algorithm with the indicated time step. For sufficiently small time steps dt,...
Platforms: Mac
License: Freeware | Size: 1.3 MB | Download (36): Molecular Dynamics Model Download |
The Ejs Foucault Pendulum model displays the dynamics of a Foucault pendulum. The simulation is designed to show the dynamical explanation of why precession of the Foucault pendulum is slower at lower latitudes. The simulation shows simultaneously the motion with respect to the inertial...
Platforms: Mac
License: Freeware | Size: 1.05 MB | Download (36): Foucault Pendulum Model Download |
The STP Hard Disks Metropolis program is a Monte Carlo simulation of hard disks in two dimensions. The default initial condition is a rectangular configuration of N=64 particles in a box of length L = 40. You can slowly increase the density of the gas (by setting the minimum scale length between...
Platforms: Mac
License: Freeware | Size: 468.99 KB | Download (43): Hard Disks Metropolis Download |
The STP LJ Thermal Equilibrium program simulates the interaction between two systems of Lennard-Jones particles brought into thermal contact. The purpose of this simulation is to explore the nature of thermal equilibrium and the relation, if any, between the kinetic and potential energies of two...
Platforms: Mac
License: Freeware | Size: 492.54 KB | Download (36): Lennard-Jones Thermal Equilibrium Download |
The STP EinsteinSolidHeatBath program simulates the exchange of energy between an Einstein solid and a heat bath. The purpose of this simulation is to determine the properties of a Einstein solid at different temperature T and to compare our results with analytical calculations of the...
Platforms: Mac
License: Freeware | Size: 901.12 KB | Download (39): Einstein Solid Heat Bath Download |
The STP 1DIsing program is a Monte Carlo simulation of a one-dimensional Ising model in equilibrium with a heat bath at temperature T using the Metropolis algorithm. The default is N=64 spins up (s = 1) with no external field with heat bath temperature T=1. STP Ising1D is part of a suite of Open...
Platforms: Mac
License: Freeware | Size: 908.29 KB | Download (37): Ising 1D Download |
The Equatorial Coordinates model displays the position of a star in equatorial (Right Ascension/Declination --- RA/Dec) coordinates. The horizon is shown along with the four cardinal directions (N, E, S, and W). The Latitude slider changes the latitude of the observer which is shown by the change...
Platforms: Mac
License: Freeware | Size: 993.28 KB | Download (36): Equatorial Coordinates Model Download |
The Ejs Inertial Oscillation model displays the motion of a particle moving over the surface of an oblate spheroid. The spheroid is flattened to an ellipsoid of revolution because it is rotating, just as the Earth is flattened because it is rotating. The particle is confined to motion along the...
Platforms: Mac
License: Freeware | Size: 1.05 MB | Download (36): Inertial Oscillation Model Download |
The Introductory Physics Pendulum Lab program asks students to develop a model for a pendulum. It is distributed as a ready-to-run (compiled) Java archive. Double-clicking the ejs_intro_PendulumLab.jar file will run the program if Java is installed. In order to modify this simulation (and see how...
Platforms: Mac
License: Freeware | Size: 1.53 MB | Download (35): Intro PendulumLab Model Download |
The Introductory Physics 2D (Projectile) Motion Lab program asks students to develop a model for a ball with projectile motion. It is distributed as a ready-to-run (compiled) Java archive. Double-clicking the ejs_intro_2DMotionLab.jar file will run the program if Java is installed. In order to...
Platforms: Mac
License: Freeware | Size: 1.34 MB | Download (35): Intro 2DMotionLab Model Download |
The EJS Equinox Precession model illustrates the Copernican theory of Earth's orbit around the sun. The top window shows a view from outside the celestial sphere. The simulation shows the moving Earth along with its axis or rotation and the line of sight from Earth, through Sun, to the Celestial...
Platforms: Mac
License: Freeware | Size: 1.32 MB | Download (36): Equinox Precession Model Download |
The Ejs Coin Rolling without Sliding on an Accelerated Platform model displays the dynamics of a coin rolling without slipping on an accelerated platform. The simulation displays the motion of the coin as well as the velocity vectors for the surface of the coin and the platform. The initial...
Platforms: Mac
License: Freeware | Size: 1.33 MB | Download (36): Coin Rolling without Sliding on an Accelerated Platform Model Download |
The Ejs Damped Driven Harmonic Oscillator Phasor model displays the motion of damped driven harmonic oscillator. The resulting differential equation can be extended into the complex plane, and the resulting complex solution is displayed with the real part of this solution being the position of...
Platforms: Mac
License: Freeware | Size: 1.38 MB | Download (36): Damped Driven Harmonic Oscillator Phasor Model Download |
The Ejs Quartic Oscillator model displays the motion of a bead moving without friction along a horizontal rod, while tied to two symmetric springs. Both the motion of the masses and the phase space plot are shown in the simulation. The natural length of the springs can be changed via textboxes....
Platforms: Mac
License: Freeware | Size: 1.34 MB | Download (37): Quartic Oscillator Model Download |
The Ejs Normal Modes on a Loaded String model displays the motion of a light string under tension between two fixed points. The string is also loaded with N masses located at regular intervals. The number of masses on the string can be changed via textboxes. You can modify this simulation if you...
Platforms: Mac
License: Freeware | Size: 1.35 MB | Download (40): Normal Modes on a Loaded String Model Download |
The Ejs Strange Harmonic Oscillator model displays the motion of two masses connected by a massless rigid rod and the masses may move without friction along two perpendicular rails in a horizontal table. The energy of the oscillator system can be changed via a slider. You can modify this...
Platforms: Mac
License: Freeware | Size: 1.43 MB | Download (41): Strange Harmonic Oscillator Model Download |