Readytorun
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 |
The EM Radiation program displays the electric field vectors (in the x-y plane) and magnetic field contours (for the field in the z direction) calculated from the Lienard-Wiechert potentials for a charged particle. The default scenario shows the resulting radiation from a charged particle in...
Platforms: Mac
License: Freeware | Size: 621.57 KB | Download (34): EM Radiation Download |
The QM Momentum Measurement program displays the time evolution of the position-space wave function and can be used to simulate the quantum-mechanical measurement of momentum. The default wave function is an equal-mix four-state superposition in the infinite square well. QM Momentum Measurement...
Platforms: Mac
License: Freeware | Size: 71.68 KB | Download (36): QM Momentum Measurement Download |
The QM Momentum Expectation Value program displays the time evolution of the position-space wave function and the associated momentum expectation value. The default wave function is a Gaussian wave packet in a harmonic oscillator. Additional states and other potential energy functions can be...
Platforms: Mac
License: Freeware | Size: 51.2 KB | Download (35): QM Momentum Expectation Value Download |
The QM Position Expectation Value program displays the time evolution of the position-space wave function and the associated position expectation value. The default wave function is a two-state superposition of infinite square well states. Additional states and other potential energy functions...
Platforms: Mac
License: Freeware | Size: 51.2 KB | Download (34): QM Position Expectation Value Download |
The STP Widom Insertion Method program estimates the chemical potential of a Lennard-Jones fluid using the Widom insertion method. The default system is a box with linear dimension L = 20 with N =100 particles at a temperature T = 1.0. STP WidomInsertionMethod is part of a suite of Open Source...
Platforms: Mac
License: Freeware | Size: 51.2 KB | Download (36): Widom Insertion Method Download |
The GR Classical program simulates orbits of objects around a central mass using Newtonian mechanics. It also displays a plot of the effective potential well in which the orbiting particle resides. GR Classical is part of a suite of Open Source Physics programs that model aspects of General...
Platforms: Mac
License: Freeware | Size: 61.44 KB | Download (35): GR Classical Download |
The STP EinsteinSolids program displays the energy distribution of an Einstein solid in thermal contact with another Einstein solid. The purpose of this program is to explore the distribution of energy between two systems in thermal contact. The default state is two Einstein solids, system A and...
Platforms: Mac
License: Freeware | Size: 102.4 KB | Download (35): Einstein Solids Download |
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 |
The STP IdealBoseGasIntegral program numerically determines the value of the chemical potential of an ideal Bose gas for a given temperature and density. STP IdealBoseGasIntegral is part of a suite of Open Source Physics programs that model aspects of Statistical and Thermal Physics (STP). The...
Platforms: Mac
License: Freeware | Size: 471.04 KB | Download (42): Ideal Bose Gas Integral Download |
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 (42): Falling Cup with Ball Model Download |
The GR Schwarzschild Particle program simulates orbits of objects around a black hole using the Schwarzschild metric. It also displays a plot of the effective potential well in which the orbiting particle resides. GR Schwarzschild Particle is part of a suite of Open Source Physics programs that...
Platforms: Mac
License: Freeware | Size: 655.36 KB | Download (36): Schwarzschild Particle Download |
The STP Multiplicative Process program simulates the outcome of a random multiplicative process, a product of random numbers. Examples of multiplicative processes include the distributions of incomes, rainfall, and the fragments sizes in rock crushing processes. Consider the latter for which we...
Platforms: Mac
License: Freeware | Size: 512 KB | Download (42): Multiplicative Process Download |
The STP IsingMeanFieldSolution program uses Newton's method to calculate solutions to the mean-field approximation to the equation of state of the Ising model. The program also displays the free energy as a function of the magnetization m for given values of T and the magnetic field H. The...
Platforms: Mac
License: Freeware | Size: 484.35 KB | Download (39): Ising Mean-Field Solution Download |
The STP IdealGasNumberOfStates program numerically evaluates the number of states of an ideal gas and demonstrates finite size effects by plotting the actual number of states and the asymptotic expression. The default is two-dimensional system (d=2). STP IdealGasNumberOfStates is part of a suite...
Platforms: Mac
License: Freeware | Size: 462.85 KB | Download (38): Ideal Gas Number Of States Download |
The STP Sensitivity to Initial Conditions program shows 11 particles in a line with the same velocity. You can perturb the system slightly and observe how sensitive the trajectory is to a small change. The default perturbation strength is 1.00001. STP SensitivityToInitialConditions is part of a...
Platforms: Mac
License: Freeware | Size: 463.87 KB | Download (43): Sensitivity to Initial Conditions Download |
The RandomWalk1D program simulates a random walk in one dimension for steps of unit length and equal time intervals. The default number of steps is N = 16 and the probability of going right or left at any step is the same (the probability p of going to the right for a single step is 0.5)....
Platforms: Mac
License: Freeware | Size: 830.46 KB | Download (35): Random Walk 1D Download |
The Driven Wave Machine model simulates a wave machine driven by a sinusoidal oscillator. The machine consists of horizontal bars welded to a torsion rod that is perpendicular to the bars. The simulation allows the user to change the number of bars, the drive frequency, and the boundary...
Platforms: Mac
License: Freeware | Size: 1024 KB | Download (36): Driven Wave Machine Model Download |
The Ejs Three Charged Particles model displays three charged objects, one at each corner of an equilateral triangle. The charges have different magnitudes - your job is to rank the charges based on their magnitudes, from largest to smallest. You can drag the charges around to see the effect on...
Platforms: Mac
License: Freeware | Size: 1.11 MB | Download (35): Three Charged Particles Model Download |
The Local Coordinates model displays the position of a star in local (Altitude/Azimuth) coordinates. The horizon is shown along with the four cardinal directions (N, E, S, and W). The latitude of the observer is set at 35.5 degrees which sets the location of the north celestial pole (teal)...
Platforms: Mac
License: Freeware | Size: 10.24 KB | Download (35): Local Coordinates Model Download |