How a DC motor works - educational tool
https://www.youtube.com/watch?v=66JXrxeZGUs
This is a very simple tool that you can print to show how a dc motor works. I got the idea from Sonic Dad you tube channel. It includes a basic dc motor found in rc cars and other items. Taking the guts out and assembling it in a configuration that you can see the details.
You will also need a battery, two paper clips, two safety pins.
See instructions...