A Normal applied by a disk on a rod

DottZakapa
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Hi all.
I'm trying to figure out how is the normal (direction) applied by two disks on a rod which connects the two disks, in order to build the second law of dynamics. See figure.
Hope you could help
Thanks
 
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There is no figure.
 
So I know that electrons are fundamental, there's no 'material' that makes them up, it's like talking about a colour itself rather than a car or a flower. Now protons and neutrons and quarks and whatever other stuff is there fundamentally, I want someone to kind of teach me these, I have a lot of questions that books might not give the answer in the way I understand. Thanks
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