Easing
Real objects speed up and slow down — they don't snap between speeds. Easing is what keeps an interface from feeling robotic.
Timing
Duration sets the mood. Too fast and a change goes unnoticed; too slow and every interaction feels sticky.
Choreography
Related elements shouldn't all arrive at once. A small stagger turns a jarring pop into a guided, readable sequence.
Continuity
When one thing becomes another, animate the change instead of cutting to it. Growing a card into its detail view keeps the user oriented — no teleporting.
Feedback
Motion confirms that an action landed. A press that depresses and a result that springs in tell the user the system heard them.
Reduced Motion
Large sliding, scaling motion can trigger nausea and migraines. Honour the user's setting by replacing movement with a gentle fade.