A trip is the same thing as throwing a hard object at somebody? No.
To me, a cheap ass play is intentional hurting somebody. Like Haynesworth stomping on Gurodes face. It's more of an extreme example but he meant to do it. Or Blount throwing a haymaker at Boise State player.
Your telling me Adams tripped him because he knew Tuck was going to land awkwardly on his shoulder. It was clear Tuck beat him and had a straight line to Romo. He tripped him because he got beat and he thought he could get away with it but in no right mind did he expect he was going to injure him.
It's against the rules, not because its a personal foul but because it's an easy way to stop somebody. We wouldn't even have this conversation if Tuck didn't get injured.
Is it a cheap shot if a player grabs the face mask and the guy hurts his neck? I never seen that.