Gallery
Discover apps people built on Collabby by chatting. Run them, then remix to make them yours.
Water Pressure Playground
Same depth means the same pressure. A middle-school playground that busts shape and surface-area myths with P=ρgh. This app was built on Collabby too · Tap 🍴 Remix below to get your own copy and change anything you like.
Periodic Table 118
A periodic table with all 118 elements. Tap the table to read periods and groups, sort families by color from alkali metals to noble gases, and find the elements that are gases or liquids at room temperature. Each tab has 4 missions. This app was built on Collabby too · Tap 🍴 Remix below to get your own copy and change anything you like.
Entropy and Reaction Spontaneity
Raise the temperature far enough and a reaction that refused to happen suddenly runs on its own.
Enthalpy and Hess’s Law
The heat of a reaction depends only on the start and end levels, never on the path taken.
Boyle’s and Charles’s Laws & Ideal Gases
Squeeze a gas and it shrinks, heat it and it swells, with pressure, volume and temperature always tied together.
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.
Galvanic Cells & Electrolysis
Create voltage from the potential difference between two metals, and explore electrodes dissolving and building up, plus the 2:1 ratio of gases produced by electrolysis.
Reaction Rate & Activation Energy
Change collision frequency with concentration, increase particles crossing the activation-energy barrier with temperature and catalysts, and explore the half-life of a first-order reaction.
Lewis Dot Structures & Molecular Shapes
Adjust bonding electrons and electron pairs around the central atom to create molecular shapes and bond angles, then use electronegativity differences to determine bond polarity.
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.
Resources & Energy
Burn oil and watch the gauge fall, then mix solar, wind, and hydro to keep the town powered even at night while cutting monthly use.
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.
Chemical Equilibrium
Change concentration, pressure, and temperature to see equilibrium shift in the direction that counteracts each disturbance.
Different Gases
Weigh air itself, change temperature and pressure to watch a balloon's volume shift, and run tests to tell oxygen, carbon dioxide, nitrogen and helium apart.
Acid–Base Titration
Add base drop by drop to an acid to locate the equivalence point, and see why the pH curve turns steep there and when methyl orange, BTB, and phenolphthalein change color.
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.
Elements and Compounds
Set the proton count to decide an element, read chemical formulas, and link atoms into molecule models.
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.
Redox Reactions
Follow a metal losing electrons as its oxidation number rises, then balance the equation by matching electrons lost with electrons gained.
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.
Moles and Concentration
Change mass and volume to find the number of moles and molar concentration, then add water to see dilution cut it to one nth.
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.
The Periodic Table
Tap any of the 118 elements to check its properties, and use the color-coded groups to spot the patterns of the periodic table.
Ohm's Law
Change voltage and resistance to find current, then compare series and parallel circuits and the strength of an electromagnet.
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.
Neutralization Reactions
Add acid and base particles to compare the H⁺ and OH⁻ released, then read the solution's nature from indicator colors and the ions left over after neutralization.
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.
Velocity-Time Graphs
Read distance off the area under a velocity-time graph, work out work as force × distance, and see mechanical energy stay constant down the hill.
Density and Boiling Point
Measure mass and volume to find density, and see that density and boiling point stay the same no matter how much of the substance you have.
Formation of Ions
Add and remove electrons to form ions, then combine them so charges cancel to zero and reveal chemical formulas and precipitates.
Boyle's Law
Add weights or heat the cylinder to see why pressure times volume stays constant while particles just squeeze closer or move faster.
Balancing Chemical Equations
Build molecules atom by atom and tune the coefficients until both sides of the arrow hold the same number of atoms.
States of Matter
Watch the particle arrangement and heating curve to see why the temperature pauses at 0 and 100 °C while the number of particles and the mass stay the same.
Pushes and Pulls
Choose the direction and strength of a push to reach the flag, and see why balanced forces leave everything still.
Energy Efficiency
Tap devices to see 100 units of input energy split into useful work and wasted heat, then compare equally bright bulbs to work out each one's efficiency.
Energy Transformation
Change the coaster's starting height and friction to see potential energy turn into kinetic energy and heat while the total stays the same.