Interactive entry

Momentum

Momentum helps keep velocity, weight, and interruptibility in motion responses.

Entrances & exits Sequencing & timing Movement & transforms State transitions

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Active entry

Preview, parameters, and exports

Momentum helps keep velocity, weight, and interruptibility in motion responses.

Motion that carries velocity, especially after a drag or interruption

Browse categories

Momentum

Duration420ms

Amplitude28px

Delay0ms

Curvespring

.motion-card {
  animation-name: motion-momentum;
  animation-duration: 420ms;
  animation-timing-function: cubic-bezier(0.32, 0.72, 0, 1);
  animation-delay: 0ms;
  animation-fill-mode: both;
  will-change: transform, opacity;
  transform-origin: center;
}

@keyframes motion-momentum {
  from {
    opacity: 0;
    transform: translateY(28px) scale(0.94);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .motion-card {
    animation-name: motion-momentum-reduced;
    animation-duration: 180ms;
    animation-delay: 0ms;
    transform: none;
    animation-iteration-count: 1;
  }
}

@keyframes motion-momentum-reduced {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

Agent prompt

Use Momentum for a UI fragment: Momentum helps keep velocity, weight, and interruptibility in motion responses. Animate transform and opacity, keep the duration at 420ms, use 28px of visual amplitude, add a 0ms delay, use spring easing (cubic-bezier(0.32, 0.72, 0, 1)), and include a reduced-motion fallback.

intent: entrancefeel: softcontext: card

Usage

Use it when you need to keep velocity, weight, and interruptibility in motion responses.
Good for low- or medium-frequency UI changes that should stay short, clear, and interruptible.
Copy the prompt or CSS and hand it to an agent for implementation.

Examples

Preview Momentum on a card, list item, or lightweight panel.
Tune duration, travel, delay, and curve until Momentum matches the surrounding interface.

Review notes

Prefer transform and opacity so motion stays off layout and paint work.
Keep UI motion under 300ms; frequent feedback should be shorter.
Avoid scale(0) and UI ease-in; use a physical starting point and a strong ease-out curve.

Reduced motion

Under reduced motion, Momentum removes travel, rotation, or looping and keeps a short fade or state comparison.

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