This transforms Disney's 12 principles of animation into a physics checklist you can actually use when motion feels off. When your animations look floaty, it tells you to add ease-in and settling oscillations. When they feel stiff, it suggests squash-and-stretch and offset timing. The core insight is solid: audiences don't analyze physics, they feel it, so your goal is believability over accuracy. The mental model of asking "what does this weigh?" before animating anything is genuinely useful. It's written for animators but the principles translate to any UI motion work where you want things to feel grounded instead of sliding around like they're on ice.
npx skills add https://github.com/dylantarre/animation-principles --skill physics-intuition