To many students physics seems to be about devices in their school labolatory, not about everyday life. That is why I use mainly ordinary objects as teaching aids. One of them is a bicycle dynamo.
You can construct a dynamo in 2 ways. Usually some coils of wire surround the rotating magnet from the sides.
Here the less frequent solution is displayed. The magnet rotates in a steel nest over a coil.
Sketchfab cannot read Blender files properly. Instead of the constant interpolation it uses the linear one what causes size pulsating when we want show object 2 in place of object 1. To avoid the problem I enlarge object 1 a frame earlier than diminishing of object 2 starts.
So if you download the file you should make little corrections in key frames with Blender.
In Blender it is easy to make colours change smoothly. Here it needs mastering Sketchfab’s API. I am not ready for it yet.
The main model is in the middle.
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