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Sea Horse Model freeware
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Sea Horse Model

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Added: July 20, 2013 | Visits: 249

Celestial Globe Model The Ejs Celestial Globe model simulates the Two Sphere Universe theory of the Ancient Greeks. This theory supposes the stars to be fixed on the surface of a Celestial Sphere, with the spherical Earth at the center of this sphere. The simulation shows the motion of Sun and stars in this model, as...



Platforms: Mac

License: Freeware Size: 1.29 MB Download (16): Celestial Globe Model Download

Added: September 23, 2013 | Visits: 301

N-body Orbits Model The Ejs N-body Orbits model displays the dynamics of three to five identical masses orbiting each other subject to Newtonian gravity. The simulation displays the periodic orbital motion of the masses. The initial configuration of the system can be changed via slider. You can modify this...





Platforms: Mac

License: Freeware Size: 1.34 MB Download (18): N-body Orbits Model Download

Added: June 27, 2013 | Visits: 224

Doppler Effect Model The Ejs Doppler Effect model displays the detection of sound waves from a moving source and the change in frequency of the detected wave via the Doppler effect. In addition to the wave fronts from the source a graph depicting the time of emission and time of detection of each of the wave fronts...


Platforms: Mac

License: Freeware Size: 1.41 MB Download (16): Doppler Effect Model Download

Added: November 29, 2013 | Visits: 195

BioTapestry BioTapestry is designed around the concept of a developmental network model, and is intended to deal with large scale models with consistency and clarity. It is capable of representing systems that exhibit increasing complexity over time, such as the genetic regulatory network controlling...


Platforms: Mac

License: Freeware Size: 890.88 KB Download (16): BioTapestry Download

Added: June 24, 2013 | Visits: 195

Circumnavigating Pendulum Model The Ejs Circumnavigating Pendulum model displays the dynamics of a mechanical oscillator in uniform circular motion. The mechanical oscillator is free to move in two directions. This 2-dimensional simulation displays all the dynamical features of the Foucault pendulum, except for the dependency...


Platforms: Mac

License: Freeware Size: 10.24 KB Download (16): Circumnavigating Pendulum Model Download

Added: September 16, 2013 | Visits: 247

Rocking Semicircular Hoop Model The Rocking Semicircular Hoop model shows the dynamics of a simple object rocking without slipping on a horizontal surface. It is a supplemental simulation for an article by Leaf Turner and Ari Turner "Asymmetric rolling bodies and the phantom torque" in the Am. J. Phys. 78, 905 (2010). The...


Platforms: Mac

License: Freeware Size: 785.41 KB Download (17): Rocking Semicircular Hoop Model Download

Added: September 15, 2013 | Visits: 285

Orbiting Mass on a Table 3D Model The Ejs Orbiting Mass on a Table 3D model displays the frictionless dynamics of two masses that are attached via a string through a hole in a horizontal table. Mass m moves on the table in two dimensions while mass M hangs vertically and just moves up and down. The simulation allows displaying...


Platforms: Mac

License: Freeware Size: 1.67 MB Download (19): Orbiting Mass on a Table 3D Model Download

Added: July 15, 2013 | Visits: 299

Driven Diatomic Oscillator Chain Model The Ejs Driven Diatomic Oscillator Chain model displays a one-dimensional diatomic chain of coupled harmonic oscillators with one end driven by an external force and the other end attached to a sliding rod shock absorber. The mass and Stoke's Law damping for the shock absorber are chosen to...


Platforms: Mac

License: Freeware Size: 1.18 MB Download (16): Driven Diatomic Oscillator Chain Model Download

Added: June 28, 2013 | Visits: 380

Heating and Cooling a Cylinder Model The Heating and Cooling a Cylinder model computes the radial temperature distribution within a long cylinder as it is heated and cooled by a surrounding fluid. The cylinder is broken into shells and the temperature of each shell is computed using a finite difference approximation to the radial...


Platforms: Mac

License: Freeware Size: 10.24 KB Download (20): Heating and Cooling a Cylinder Model Download

Added: September 11, 2013 | Visits: 250

Magnetic Bar Field Model The EJS Magnetic Bar Field Model shows the field of a bar magnet and has a movable compass that reports the magnetic field values. The bar magnet model is built by placing a group of magnetic dipoles along the bar magnet. You can modify this simulation if you have Ejs installed by right-clicking...


Platforms: Mac

License: Freeware Size: 92.16 KB Download (17): Magnetic Bar Field Model Download

Added: August 19, 2013 | Visits: 211

Duffing Oscillator Model The Ejs Duffing Oscillator 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 the solution as well as the phase space and Poincare plots, and energy diagram....


Platforms: Mac

License: Freeware Size: 1.37 MB Download (17): Duffing Oscillator Model Download

Added: June 15, 2013 | Visits: 244

Phase Space Plotter Model The Ejs Phase Space Plotter model displays the dynamics of an ensemble of pendula or simple harmonic oscillators in phase space (velocity versus position). Friction is initially set to zero but can be changed via a textbox as can the number of elements in the ensemble. For the pendulum ensemble,...


Platforms: Mac

License: Freeware Size: 1.4 MB Download (17): Phase Space Plotter Model Download

Added: July 14, 2013 | Visits: 220

Point Charge Forces in 1D Model The Point Charge Forces in One-Dimension model investigates the electric force that one charged particle exerts on another. It is a very simple representation that promotes understanding of Coulomb's Law in three ways: First, students can set the amount of charge on each particle and view vector...


Platforms: Mac

License: Freeware Size: 1.37 MB Download (16): Point Charge Forces in 1D Model Download

Added: November 05, 2013 | Visits: 226

Lagrange Top Model 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 (16): Lagrange Top Model Download

Added: July 27, 2013 | Visits: 264

Simultaneity Spacetime Diagram Model 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 (16): Simultaneity Spacetime Diagram Model Download

Added: November 13, 2013 | Visits: 277

Molecular Dynamics Model 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 (17): Molecular Dynamics Model Download

Added: October 15, 2013 | Visits: 165

Foucault Pendulum Model 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 (16): Foucault Pendulum Model Download

Added: August 17, 2013 | Visits: 218

Equatorial Coordinates Model 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 (16): Equatorial Coordinates Model Download

Added: October 29, 2013 | Visits: 203

Inertial Oscillation Model 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 (16): Inertial Oscillation Model Download

Added: August 11, 2013 | Visits: 226

Equinox Precession Model 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 (16): Equinox Precession Model Download

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