The Catalog of Sims astronomy basics cosmology gravitation historical orbits solar-system math algebra functions vectors physics Rotations and Torque circular-motion electrostatics forces historical kinematics light modern momentum optics oscillations rotation sound waves astronomy Simulations historical The Celestial Sphere A 3d model of the ancient celestial sphere concept. View The Sim! About/Instructions Epicycles Simulator A tool to visualize epicycles View The Sim! About/Instructions solar-system The Earth in Orbit (simplified) A 3d model earth in orbit around the sun View The Sim! About/Instructions A (long) Day on Mercury A simulation that shows the length of a day on Mercury View The Sim! About/Instructions cosmology Expanding Universe An expanding universe has no center. View The Sim! About/Instructions gravitation A simple gravity assist Watch a smaller body getting a gravity assist from a larger body View The Sim! About/Instructions Tidal Forces Observe the effects of tidal forces on a two body system View The Sim! About/Instructions Two Body Orbits - One large One large and one small body in orbit View The Sim! About/Instructions Two Body Orbits Two bodies orbiting a common barycenter View The Sim! About/Instructions orbits Kepler's Second Law Equal Areas in Equal times View The Sim! About/Instructions basics Solar day vs. Sidereal day A solar day is just a little longer than a sidereal day. See how! View The Sim! About/Instructions math Simulations functions The Origins of Sine and Cosine Functions Rotations around the unit circle can make sinusoidal functions. View The Sim! About/Instructions Adjustable Parabola Plot Change the coefficients that determine a parabola View The Sim! About/Instructions Adjustable Sine Function Change the coefficients that determine a basic sine function View The Sim! About/Instructions A Decaying Sinusoidal Function Change the coefficients that determine a basic sine function View The Sim! About/Instructions Square Wave Fourier Series Summing up certain sine waves will produce a square wave View The Sim! About/Instructions Beating shown graphically Add two sine waves and change the relative frequency of one, slightly View The Sim! About/Instructions Sum of Two Sine Waves Add two sine waves and change the relative phase View The Sim! About/Instructions Triangle Wave Fourier Series Summing up certain sine waves will produce a triangle wave View The Sim! About/Instructions vectors Random Walk A Random walk or two or twenty View The Sim! About/Instructions Vector Addition View The Sim! About/Instructions Vector Components View The Sim! About/Instructions algebra Visualizing Averages The average of any two quantities can be seen graphically View The Sim! About/Instructions physics Simulations modern The Bohr / de Broglie Model Change the energy level of the electron in this Bohr Model View The Sim! About/Instructions Quantum Scattering Change the parameters affecting quantum scattering. View The Sim! About/Instructions Summing up Many Sine Waves This is an abstract representation of the Uncertainty Principle. View The Sim! About/Instructions momentum Cats in a raft Tossing cats from a raft has never been this fun! View The Sim! About/Instructions electrostatics Electric Dipole in an Electric Field Adjust the field strength and observe the effects on the dipole View The Sim! About/Instructions light Double Slit Intensity graph Adjust the variables in a double slit experimental setup to see their effects on the intensity plot. View The Sim! About/Instructions Diffraction Grating Intensity graph Adjust the variables in a n-slit (i.e. diffraction grating) experimental setup to see their effects on the intensity plot. View The Sim! About/Instructions Single Slit Intensity graph Adjust the variables in a single slit experimental setup to see their effects on the intensity plot. View The Sim! About/Instructions historical Force and Motion A replica of an old simulation. View The Sim! About/Instructions forces A Block on a Ramp, with Friction See how a block on a ramp will respond to the angle of the ramp and a shoving force. View The Sim! About/Instructions kinematics A kinematic cart simulator See the ball fall back into the cup. View The Sim! About/Instructions Plot the Kinematics of an Elevator See three graphs of position, velocity, and acceleration for an elevator moving up and down. View The Sim! About/Instructions oscillations Pendulum with plots See how a pendulum correlates with the kinematic variables View The Sim! About/Instructions A Spring and its parameters Adjust the parameters of a spring mass system and see the effects View The Sim! About/Instructions optics Ray Diagram Change the parameters for a converging lens system View The Sim! About/Instructions rotation A rotating wheel See the tangential velocity vectors on a rotating wheel. View The Sim! About/Instructions circular-motion Simple Solar System add planets to a simple solar system View The Sim! About/Instructions sound Radially Propagating Sound Waves soundwaves are oscillations in pressure as function of position and time. View The Sim! About/Instructions Standing Sound Waves in a Closed-Closed Tube soundwaves are oscillations in pressure as function of position and time. View The Sim! About/Instructions Standing Sound Waves in a Closed-Open Tube soundwaves are oscillations in pressure as function of position and time. View The Sim! About/Instructions Standing Sound Waves in an Open-Open Tube soundwaves are oscillations in pressure as function of position and time. View The Sim! About/Instructions Soundwaves soundwaves are oscillations in pressure as function of position and time. View The Sim! About/Instructions Two Speakers - 1D interference The spacing between two speakers changes the interference of the sound waves. View The Sim! About/Instructions waves A Standing Wave with Labels A standing wave labeled with node and antinode and adjustable wavelength. View The Sim! About/Instructions A Standing Wave A standing wave formed by two traveling waves and adjustable angular frequency. View The Sim! About/Instructions Adjustable Traveling Wave Change the coefficients that determine a traveling sine wave View The Sim! About/Instructions Traveling Wave Amplitude Note how the amplitude affects a transverse traveling wave View The Sim! About/Instructions Traveling Wave Vectors Visualize the velocity of the constituent particles of a traveling wave. View The Sim! About/Instructions Traveling Wave A simple traveling wave showing the motion of the medium. View The Sim! About/Instructions Wave in a medium See the wavelength change as a wave passing thought different mediums View The Sim! About/Instructions Rotations and Torque Torque on a Wrench Adjust the position, angle, and magnitude of a force applied on a wrench. View The Sim! About/Instructions