In reality a ball takes a certain amount of time to fall from a certain height. This time is the same whether it is a tennis ball or a cannon ball. But do we really want this to be case? This is where emotional physics comes into place. What world do the chracters inhabit ? – the mental and physical world. Is this a character that will need a 4 frame recovery after a jump or a 9 frame recovery? This is a decision that I feel most animators make instinctively. OR they talk about it in terms of believability or acting. No matter what terms are used it is a decision that every animator has to make.
