The universe is always in motion.
Physics is our way of asking why. Why do planets orbit, light bend, and tiny particles behave like waves? Start with the big ideas, then put one to the test.
One universe. Different scales.
No single model explains everything. Each theory is a lens, sharpened for a different part of nature.
Theories
Models turn observations into predictions. Explore scientific models and a developing hypothesis about geometry and spacetime.
Explore the research → 02 / Everyday scaleNewtonian physics
Forces change motion. From falling apples to soaring rockets, three laws describe the world we can touch.
Building in progress → 03 / Cosmic scaleRelativity
Compare moving clocks, tilt spacetime, fly a twin voyage, and explore gravitational redshift and Einstein rings.
Explore six relativity labs → 04 / Invisible scaleQuantum & electromagnetic
Mix and separate Fourier waves, explore Maxwell’s fields, and see light and quantum wave packets in action.
Explore the wave lab →Over the wall.
On the mark.
Set your angle, speed, and launch height. Clear the wall and land within 2 meters of the flag to light up the sky. Fewer attempts and closer landings earn more points.
x = v₀ cos(θ)t0.0 m
y = h₀ + v₀ sin(θ)t − ½gt²0.0 m
Flight time t0.00 s
? Uniform Earth gravity · no air resistance · the ball is modeled as a point. Touching the wall stops the shot. The flag marks the ground target; a landing error of 2.00 m or less wins.
Scoring & model notes
Each cleared course awards up to 1,000 points. Landing error costs 150 points per meter and each retry costs 60, with a minimum of 100 for a successful shot. A course can be scored once before moving on. Points and cleared targets last for this page session. A blocked shot earns no points, even if its unobstructed trajectory would have reached the flag.
The launch platform sets the initial ball height h₀. The wall is an ideal thin vertical obstacle at a known horizontal position. Collision time and landing time are calculated exactly, so frame rate and pauses cannot change the result. The ball, flag, and fireworks are enlarged for visibility. Reduced-motion mode replaces moving fireworks with a still celebration. At equal launch and landing heights, 45° maximizes range for a fixed speed; elevated launches can have a different optimum.