difference between mom_contact_normal and mom_contact_vector

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What's the difference between mom_contact_normal and mom_contact_vector?

 

I tought i would need to use mom_contact_normal, but the values were off. Using the review tool, i saw the values i expected were correct using mom_contact_vector variable. 

 

But i couldn't find any documentation on what mom_contact_vector exactly is, and i feel quite uncomfortable using it, not knowing exactly what it is.