Also: when moving between colinear states, UIView spring animations give same result as dynamics but more efficiently and compactly.
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Make CASpringAnimation public? I think it's slightly easier to understand.
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My experience has been that people have poor intuition for those parameters' meaning.
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(can do tricks with UIView spring animations to get an instance of one, but it feels dirty)
I like all the graphics you included! But a decaying sine wave isn’t the equation of motion for a damped spring!
Happy to help! True eqn’s come from solving F = -kx - cx’:
Great analysis! I too have been confused as to why all libraries are numerical. Analytical sol'n is straightforward enough…