I didn’t knew about it until now, but I checked it.
And I don’t think this 51 exercises will be helpful for you if you are going to create animation to explain physics.
The 51 exercises are mostly of character animation and may be suitable for frame by frame style animation. If most of your animation will be technical based, then rather than practicing animation, I think it would be better for you to start learning the software more.
Some important things to learn
- Get familiar with the interface
- Layers and basic transformations (rotation, scaling, skew, etc.)
- Understand how mask works
- Converters/Export Value
- Exported canvas
I think these are important things to learn if you will be using Synfig for explaining physics. You should really focus on converters and exported value so that you can represent a animation mathematically and will be helpful for you.
One thing that I always tell is, Synfig is vector animation program, so start thinking your animation in interpolation between values / tweening. Rather than frame by frame. If you have any doubts then feel free to ask.