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Evolutionary Model freeware
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Evolutionary Model

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Added: September 24, 2013 | Visits: 538

Diffraction and Interference Model: Single and Double Slits The Diffraction and Interference Model: Single and Double Slits shows diffraction and interference patterns from a single slit, double sources and double slits. The user can change the source wavelength, slit width, separation and distance between slit and screen. The Diffraction and...



Platforms: Mac

License: Freeware Size: 808.96 KB Download (37): Diffraction and Interference Model: Single and Double Slits Download

Added: July 30, 2013 | Visits: 358

Eratosthenes Model The Eratosthenes model displays the shadows cast by two gnomons (sticks) at different locations on Earth. For one gnomon, Sun is directly overhead (as would be the case if the gnomon was on the Tropic of Cancer at the summer solstice). The other gnomon is due north of the first gnomon. The sizes...





Platforms: Mac

License: Freeware Size: 860.16 KB Download (34): Eratosthenes Model Download

Added: October 16, 2013 | Visits: 482

Waves and Phasors Model The Ejs Waves and Phasors model displays the motion of a transverse wave on a string and the resulting phasors for the wave amplitude. The simulation allows an arbitrarily polarized wave to be created. The amplitude, period, phase velocity and number of phasors displayed can all be changed via...


Platforms: Mac

License: Freeware Size: 1.32 MB Download (36): Waves and Phasors Model Download

Added: October 04, 2013 | Visits: 432

Transverse Wave Model The Ejs Transverse Wave model displays the motion of a transverse wave on a string. The simulation allows an arbitrarily polarized wave to be created. The magnitude of the components of the wave and the relative phase between the components of the wave can all be changed via sliders. You can...


Platforms: Mac

License: Freeware Size: 1.4 MB Download (35): Transverse Wave Model Download

Added: June 13, 2013 | Visits: 454

Resonance in a Driven String Model The Ejs Resonance in a Driven String model displays the displacement of taut string with its right end fixed while the left end is driven sinusoidally. The driving frequency, amplitude, and the simulation's dt can be changed via text boxes and the motion can be further fine tuned by zooming in...


Platforms: Mac

License: Freeware Size: 1.36 MB Download (36): Resonance in a Driven String Model Download

Added: November 09, 2013 | Visits: 619

Angular acceleration of a Contracting System Model The EJS Angular Acceleration of a Contracting System model shows a mass and pulley system to illustrate what happens when a rotating system contracts. When the centripetal force has contracted a rotating system to half its initial radius then: (1) The tangential velocity has doubled, (2) The...


Platforms: Mac

License: Freeware Size: 1.08 MB Download (39): Angular acceleration of a Contracting System Model Download

Added: June 26, 2013 | Visits: 411

Spring Pendulum Model The Ejs Spring Pendulum model displays the model of a hollow mass that moves along a rigid rod that is also connected to a spring. The mass, therefore, undergoes a combination of spring and pendulum oscillations. The initial position and velocities, as well as the spring constant can be changed...


Platforms: Mac

License: Freeware Size: 1.37 MB Download (36): Spring Pendulum Model Download

Added: June 12, 2013 | Visits: 410

Pendulum Motion Model The Pendulum Motion Model shows the motion of a simple pendulum. You can change the mass of the pendulum bob, the length of the string, the acceleration due to gravity, and the initial position of the pendulum. You can then see the resulting motion of the pendulum, as well as see bar graphs of...


Platforms: Mac

License: Freeware Size: 1.41 MB Download (35): Pendulum Motion Model Download

Added: July 11, 2013 | Visits: 482

Orbits Within Spherical Galaxies Model The Orbits Within Spherical Galaxies model displays the two-dimensional trajectories of particles (stars) within a galaxy having a spherically symmetric mass distribution that heuristically approximates the distributions found in galaxies and bulges. The model uses a mass density proposed by...


Platforms: Mac

License: Freeware Size: 1.4 MB Download (34): Orbits Within Spherical Galaxies Model Download

Added: July 09, 2013 | Visits: 483

Ikeda Delay Differential Equation Model The Ikeda Delay Differential Equation model shows the dynamics of a delay differential equation that depends on the value of the dynamical variable x(t) at a previous time x(t-?). Sprott shows that these systems provide elegant examples of chaos in systems that are too simple to exhibit chaos...


Platforms: Mac

License: Freeware Size: 778.24 KB Download (36): Ikeda Delay Differential Equation Model Download

Added: October 02, 2013 | Visits: 532

Two Falling Rods Model The Ejs Two Falling Rods model displays the dynamics of two rods which are dropped on a smooth table. In one case the end point on the table slides without friction, while in the other case it rotates about a pivot point. The simulation allows computing fall times and trajectories. The initial...


Platforms: Mac

License: Freeware Size: 1.4 MB Download (36): Two Falling Rods Model Download

Added: October 03, 2013 | Visits: 530

Quartic Potential Orbit Model The Ejs Quartic Potential Orbit model displays the dynamics of a mass orbiting a much larger mass subject to a quartic potential, C/r4. The simulation displays the motion of the smaller mass and the effective potential energy diagram. The initial energy of the system can be changed via textbox...


Platforms: Mac

License: Freeware Size: 1.35 MB Download (34): Quartic Potential Orbit Model Download

Added: September 12, 2013 | Visits: 479

Three State Nuclear Decay Model The Three State Nuclear Decay model extends the Two State Nuclear Decay model to simulate the radioactive decay of atomic nuclei in which the parent nucleus first decays into an intermediate state before decaying into a stable state. Although the decay of both the parent and intermediate nucleus...


Platforms: Mac

License: Freeware Size: 921.6 KB Download (35): Three State Nuclear Decay Model Download

Added: September 22, 2013 | Visits: 488

Car Race Model The Car Race model is a Java-based simulation that will help students visualize the difference between constant velocity and constant acceleration. It features the classic physics scenario in kinematics: a lead car travels at constant velocity on a straight track, while a second car moves from...


Platforms: Mac

License: Freeware Size: 1.33 MB Download (38): Car Race Model Download

Added: November 23, 2013 | Visits: 427

Three Point Charges Model The Three Point Charges is an inquiry-based model for exploring the force between charged objects. Initially, the simulation sets up three charged objects, one at each corner of an equilateral triangle. The charges have different magnitudes, represented by force vectors. The charges can be moved,...


Platforms: Mac

License: Freeware Size: 102.4 KB Download (34): Three Point Charges Model Download

Added: July 05, 2013 | Visits: 511

Great Circles Model The Ejs Great Circles model displays the frictionless motion of a particle that is constrained to follow the surface of a perfect sphere. The sphere rotates underneath the particle, but since there is no friction, and the sphere is perfectly spherical, the motion of the particle is not influenced...


Platforms: Mac

License: Freeware Size: 10.24 KB Download (35): Great Circles Model Download

Added: October 25, 2013 | Visits: 553

Three Current-Carrying Wires Model The Ejs Three Current-Carrying Wires model is a ranking task exercise involving the ranking of the current magnitudes in three parallel current-carrying wires. The simulation displays the net force on each wire because of the other two wires. You can modify this simulation if you have Ejs...


Platforms: Mac

License: Freeware Size: 1.16 MB Download (38): Three Current-Carrying Wires Model Download

Added: September 20, 2013 | Visits: 559

Slipping and Rolling Wheel Model The EJS Slipping and Rolling Wheel Model shows the motion of a wheel rolling on a floor subject to friction. The simulation allows the user to change the initial translational and rotational velocities of the wheel, v and ?Ya*, the mass, radius, and mass distribution, R, m, and C of the wheel. By...


Platforms: Mac

License: Freeware Size: 1.1 MB Download (36): Slipping and Rolling Wheel Model Download

Added: August 25, 2013 | Visits: 471

Falling Cup with Ball Model The Falling Cup with Ball model shows a mass attached to the inside of a cup with a light spring. The cup is held upside down with the mass hanging out of the cup, then released from rest. What happens when the cup is released? 1. The mass will extend the spring, like a parachute, due to air...


Platforms: Mac

License: Freeware Size: 10.24 KB Download (36): Falling Cup with Ball Model Download

Added: July 08, 2013 | Visits: 430

Wave Packet Model The Ejs Wave Packet model displays the motion of an approximate wave packet. The simulation allows an arbitrarily wave packet to be created. The default dispersion relation, with the frequency equal to the wavenumber, results in a wavepacket that does not spread. The amplitude, maximum and...


Platforms: Mac

License: Freeware Size: 1.4 MB Download (35): Wave Packet Model Download

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