Physics kids can launch, swing and switch on.
CometCraft’s Physics Playground has 10 short lessons on forces, gravity, motion, energy, simple machines, waves, circuits and magnets. Lessons mix plain-language explanations, sourced facts and quick questions, and most include an interactive simulation.
Learn the rule, then test it.
Every simulation runs on the same formulas the lessons teach, and each one is a small challenge with a goal to reach.
Projectile launcher
Set the launch angle and speed, then try to land on a target. The flight path uses the real equations of motion with g = 9.8 m/s².
Pendulum lab
Swap the bob’s mass and see the swing time stay the same, then change the string length to hit a target period: T = 2π√(L/g).
Balance beam
Hang blocks on pegs until both sides balance. Each side’s turning effect is shown as weight × distance.
Circuit builder
Wire two bulbs in series or parallel, flip the switches and see which bulbs light. Older students can read current, voltage and power from Ohm’s law.
Wave maker
Change frequency and amplitude to match a target wave, and see the wavelength follow from wavelength = speed ÷ frequency.
Drop tower
Drop a feather and a bowling ball with the air on, then off. Without air resistance, they land together.
From pushes and pulls to Ohm’s law.
Younger students start with forces, simple machines and magnets. Older students work with speed and acceleration, projectiles, energy and V = I × R.
- Forces & Newton's Laws (from grade 3)
- Gravity & Falling (from grade 4)
- Speed, Velocity & Acceleration (from grade 6)
- Launch Lab: Projectiles (from grade 7)
- Energy & Pendulums (from grade 5)
- Simple Machines (from grade 3)
- Waves, Sound & Light (from grade 4)
- Electricity & Circuits (from grade 4)
- Magnets & Magnetism (from grade 3)
- Capstone: Physics Challenge (from grade 7)
Checked numbers, named sources.
Facts in the lessons cite sources such as NASA, Britannica and OpenStax College Physics. Every calculation a lesson asks for is checked by automated tests against the same physics code the simulations run on.
Try the Physics Playground.
Sign in with an email link, open Learn, and start with Forces & Newton’s Laws. No password, no card.