Reply To: how do I throttle the speed

Hey Martin.

In your case it will be best to move both the last keyframes (on the spin) together.

Now let’s have a think about what the curves actually mean (well the Green curve)
It shows the change in value over time.

So reading it from left to right – it is going downwards, becomes less steep, and then changes direction and slows into the next keyframe (back up)
That means it is rotating one direction, slows down to a stop, and then starts rotating the other direction and slows down to a stop.

So your rotation curve is actually generally doing the right thing.  The tricky part is making it do the right amount of that thing at the right time.

Your translation looks pretty good – so the next trick is to make the spin curve stop and change direction at the same time the translation does those things. 

The part after that is harder – you need to make it spin the right amount of distance to those spots.

If there is too much spin (ball is doing a burn out) you need to reduce the vertical height difference between your keyframes.

If the ball is sliding (under rotation) you need to increase the vertical height difference between your keyframes. 

The last part is the super hard part of this exercise but it’s actually what it’s all about.

It’s an exercise to train your eye (and to practice controlling things in the Graph Editor)

You will never have to do this in ‘the real world’ – but if you strengthen your eye, everything else in animation becomes easier.

Hope that helps.