Every time the disc strikes a wall, a ring spreads out from that spot — exactly like a stone dropped in a pond. That expanding ring is a tiny wave: a disturbance carrying energy outward, while the surface it travels on only bobs in place.
Watch the rings bloom from each contact point and fade as they grow. Every strike sends a little wave outward, just like a stone dropped in a pond — a disturbance carrying energy away while the surface only bobs. (This is an in-the-picture flourish, a visual echo of the impact, not the disc's own motion.)
A wave is a disturbance that travels outward, carrying energy from one place to another without carrying the material itself along. Drop a stone in a pond and a ring of ripples spreads out; the water bobs up and down in place while the ring travels. In Kinetica, each wall strike spawns just such a ring — a little wave radiating from the point of impact.
A wave begins with a disturbance — the impact — that pushes the medium, which pushes its neighbour, and so on, passing the disturbance along while the medium stays put on average. A wave has a wavelength (the distance between crests), a frequency (how many pass each second), an amplitude (its strength), and a speed linking them: v = f λ. Ripples spread as expanding circles because the disturbance travels outward equally in every direction.
Each time the disc hits a wall, the game draws a ring expanding from the contact point — a wave spawned by the impact. The rings fade as they spread, the way real ripples weaken with distance because their fixed energy is shared around an ever-larger circle. It is an in-the-picture flourish, a visual echo of the physics of impact layered onto the motion, not part of how the disc moves.
Waves come alive when you watch rings march outward at a steady speed — and see the crests bunch closer as you tap faster.
The rings always travel at the same speed; tapping faster just packs more crests into the same distance, so the wavelength falls.
Toss a pebble in and rings spread outward, but a floating leaf only bobs up and down and stays put. That is the signature of a wave: the energy travels across the water while the water itself goes nowhere.
A clap sends a wave of pressure rippling out through the air to your ear. The air molecules jiggle back and forth in place and pass the disturbance along; nothing blows across the room, yet the sound still reaches you.
Far out at sea, waves can race for thousands of kilometres, carrying enormous energy, while the water mostly circles in place. Only near the shore, where the wave finally breaks, does the water rush forward.
Every wall strike in Kinetica sends out a ripple, a tiny window onto how waves work. This FAQ explains what a wave really carries, why the medium stays put, how wavelength, frequency, and speed connect, and where waves show up all around us.
A wave is a disturbance that travels and carries energy from one place to another, without carrying the material it moves through along with it. Drop a stone in a pond and a ring of ripples spreads outward: that ring is a wave. The water itself does not flow to the bank — it just bobs up and down as the ripple passes. It is the disturbance, and the energy it carries, that travels.
Just energy. This is the key idea about waves: they transport energy across a medium while the medium stays roughly in place. A floating leaf on a rippled pond bobs up and down but does not drift to the shore, proving the water is not travelling with the wave. The same is true of sound in air and of ocean swells far from land — energy races along while the material only jiggles in place.
Because a wave passes the disturbance from one patch of water to the next, rather than pushing the whole pond forward. As a ripple arrives, each patch of surface rises and falls, nudging its neighbour to do the same a moment later, and then settles back. The up-and-down motion is handed along the surface, so the wave travels outward even though no single bit of water makes the journey.
| Quantity | What it measures |
|---|---|
| Wavelength λ | The distance between one crest and the next |
| Frequency f | How many crests pass each second (hertz) |
| Amplitude | The wave's height, or strength |
The wave equation says a wave's speed equals its frequency multiplied by its wavelength: v = f λ. Frequency is how many crests pass each second and wavelength is the distance between crests, so multiplying them gives how far the wave advances each second, which is its speed. Because the speed is usually fixed by the medium, raising the frequency forces the wavelength to shrink, and vice versa — they trade off to keep v the same.
Because the wave's fixed amount of energy gets shared around an ever-larger circle. When a ripple is small, its energy is packed into a short ring; as the ring grows, that same energy is spread thinner and thinner along a longer and longer circumference. With less energy per length, the wave's amplitude drops, so the ripple looks weaker the farther it travels, eventually fading away.
A wavefront is the leading edge of a wave — the line or surface joining all the points that are disturbed at the same instant. For ripples from a single splash, each wavefront is one of the expanding circles you see racing outward. Far from the source, a small piece of a circular wavefront looks almost straight, which is why distant ripples and ocean swells arrive as nearly parallel lines.
Yes, sound is a wave, though it travels through air rather than across water. A clap squeezes the air, sending a ripple of pressure outward; the air molecules jostle back and forth in place and pass the disturbance along to your ear. Like a pond ripple, sound carries energy without carrying the medium across the room, and it has a wavelength, a frequency that sets its pitch, and an amplitude that sets its loudness.
Yes. A harder strike or a heavier stone puts more energy into the disturbance, which shows up as a larger amplitude — taller, stronger ripples. The wavelength and speed depend mostly on the medium rather than the force, so a big splash and a small splash send their rings out at the same speed, but the big splash's rings start much taller and take longer to fade.
It means Kinetica draws them as a visual flourish, echoing the physics of an impact rather than fully simulating a water surface. The rings are honest about being a drawn effect, layered onto the disc's real motion for feel and beauty. Kinetica keeps this label clear so you can tell which parts of what you see come from the simulated physics and which, like these decorative ripples, are choices about how to draw the moment of impact.
Because the disturbance spreads outward equally in every direction across a flat, even surface. Starting from one point, the wave travels the same distance in all directions in the same time, so the set of points it has reached forms a circle that grows steadily. If the surface were uneven, or the source were a long bar rather than a point, the wavefronts would take other shapes, but a point splash on still water gives expanding circles.
For sound, the frequency of the wave is what your ear perceives as pitch. A high frequency, with many pressure crests arriving each second, sounds high-pitched, like a whistle; a low frequency sounds deep, like a drum. The amplitude sets the loudness separately. So a wave's frequency does double duty: with wavelength it fixes the speed, and on its own it determines how high or low a sound seems.
Almost everywhere. Sound reaching your ears, ripples on a pond, ocean swells, the wobble of a plucked guitar string, and the light from every lamp and screen are all waves. Radio, wifi, and mobile signals are waves too, carrying information through the air. The same handful of ideas — wavelength, frequency, amplitude, and speed — describes them all, which is why understanding one ripple helps you understand a whole world of waves.
Wave physics underpins much of modern life. Musicians and engineers shape sound waves; sonar and ultrasound send waves out and time their echoes to map the seabed or an unborn baby; radio and wifi encode messages onto waves of a chosen frequency; and noise-cancelling headphones add an opposite wave to silence unwanted sound. Mastering wavelength, frequency, and amplitude lets us create, detect, and control waves for countless purposes.
Because it shows the heart of a wave in one clear picture: a disturbance born at a point, spreading outward as a growing ring, carrying energy while the water only bobs, and fading as that energy thins around the circle. From that one image you can read off the wavefront, the idea of amplitude, the spreading of energy, and the difference between what travels (energy) and what stays (matter) — the foundations every other wave builds on.
Seven question formats, the way Beyond Dictionary serves them. Every question has layered hints — a quick nudge, the reasoning, then a deeper connection — so a wrong answer opens a door, never a dead end. 32 questions across all seven formats — multiple choice, multiple-correct, fill-in-the-blank, match, sequence, read-think-connect, and write-your-own.