animation-vocabulary

Describe what the effect looks or feels like in plain words, such as springy or slides off. The glossary maps that sensation to the exact term, like Pop in for a bouncy entrance or Rubber-banding for iOS overscroll resistance.

A morph is one shape smoothly turning into another shape, like Dynamic Island. A shared element transition is an element traveling and transforming from one position into another, like a thumbnail expanding into a card.

It is called rubber-banding: resistance and snap-back when you drag past a boundary, the familiar iOS overscroll feel. It belongs to the feedback and interaction category of motion effects.

Springs use physics parameters like stiffness, damping, and mass rather than a fixed duration, producing motion that can be interrupted and redirected mid-flight. Easing curves like ease-out suit simple, fixed-duration UI transitions.

The Skill names the closest matching term and states plainly that it is an approximation, or describes the effect using existing glossary vocabulary. It does not invent new terms outside the curated list.