Gallery
Discover apps people built on Collabby by chatting. Run them, then remix to make them yours.
Simple Harmonic Motion & Pendulum Periods
A pendulum's period is set by its length and gravity, never by the mass of the bob.
Torque & Rotational Balance
The same push turns a bolt more or less depending on where and at what angle it is applied.
Energy Levels & Line Spectra
The size of the jump an electron makes between levels is exactly the color of light you see.
The Photoelectric Effect and Light’s Particle Nature
Red light never ejects an electron no matter how bright, but change its color and they pop out at once.
Electric Fields & Potential
Change electric field lines by varying the sign and size of charges, and see how Coulomb force and potential change with distance.
Heat Engines & Efficiency
Calculate efficiency from heat in and work done, then explore the limit set by two reservoir temperatures and the area of a P–V loop.
Parabolic Motion
Change the angle and speed to compare range and peak height, and see that a horizontally thrown ball and a dropped ball are at the same height.
Additive Color Mixing
Overlap red, green, and blue light and change the lamp to see that an object's color comes from the light it reflects.
How Electric Motors Work
Flip the current and field directions, then toggle the commutator to see why a motor keeps spinning one way.
Balanced Forces and Friction
Balance F1 against F2 to zero the net force, then vary the slope angle and the friction coefficient to catch the instant static friction gives way to kinetic friction.
Electromagnetic Induction
Vary the magnet's speed and the number of coil turns to measure the induced EMF, then flip the pole to see Lenz's law oppose the change.
Conservation of Mechanical Energy
Potential and kinetic energy trade off as you vary the release height and switch friction on, showing when their sum stays constant.
Momentum Conservation & Collisions
Momentum p = mv is built by changing mass and speed, and sliding the coefficient of restitution from 0 to 1 shows that total momentum stays the same whether bodies stick or bounce.
Wave Interference
Vary the path difference and source motion to see constructive and destructive interference, standing-wave antinodes, and the Doppler shift.
Uniformly Accelerated Motion
Adjust the acceleration to watch speed build each second, and see how the v-t graph's slope and area reveal acceleration and distance.
Buoyancy
Change volume, shape, and water saltiness to see when buoyancy wins over weight.
Sound and Wavelength
Adjust wavelength and amplitude to hear how pitch, volume and timbre change, and how fast sound travels through different media.
Types of Forces
Compare mass and weight across the Moon, Earth, and Jupiter, then stretch a spring and switch contact surfaces to find what friction really depends on.
Specific Heat and Thermal Equilibrium
Change the substance, the amount and the heating time, then mix samples to see how specific heat and the final equilibrium temperature are decided.
Reflection and Refraction
Move an object toward and away from a mirror, water surface, and convex lens to trace the rays and see where each image forms and how big it looks.
Static Electricity and Current
Change charge signs, distance, and a magnet's motion in a coil to see charge conservation, the inverse-square law, and how change—not presence—makes current.
Wind Tunnel Lab
Type any object to create a 3D model and test it in a virtual wind tunnel, calculating drag, lift, and aerodynamic forces in real time!