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Originally Posted by sgt_doofey
It's simple Physics, but unfortunately, it's been quite a number of years since I did it at high school. The 3T 4wd will exert more force on the lighter 1T car due to it's mass.
Force = mass x acceleration
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You've forgotten newton's 3rd law, the forces on each will be of exactly the same magnitude but in opposite directions.
Since the force on each is the same, then the object with the higher mass will suffer less acceleration, newton's 2nd law.
Basically in any two or more vehicle collision, higher mass vehicle suffers the less change in speed and is more survivable for the occupants.