What you are saying becomes obvious if you take it to the absurd extreme.
A freight train running into a small animal, while the animal is virtually vaporized the train will not notice a thing.
Yes, but I think it still holds true before it goes to the extreme as well: If you take two Tahoes and ram them into each other going 35mph each and then take 2 small cars and ram them into each other going 35mph, the people in the Tahoes are going to be hurting worse than the ones in the small cars even if everybody is wearing a seatbelt.
Edit: It might actually be about acceleration, not momentum, I'm second-guessing myself. I'll have to ruminate on this for a bit.
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