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bros and sis, heard so many times that such and such make is heavier so it is more stable at high speed. I thought about it for a moment, it is not the only thing that make a car stable. I just reason out with my limited physics knowledge. Please anyone chip in with your thoughts. A heavier object need higher force to get the moving and once it is in motion, it take larger force to slow it down. for example, at Mini Cooper needs less braking power comparing with a Mercedes limosine in order to stop from 100km/h to 0. why? I think the answer is inertia. Inertia can work in favour of the Merc in the scenario where by , eg. both car hit a brick the size of a fist. the mini has to fight very hard to stay on course. but the Merc could be not affected so much. by telling the uninformed about stable at high speed , it is only tiny bit of the whole picture. F1 car 600+kg only, they are stable and agile. The moral of the story is, there is a lot more that just weight to make a car stable at high speed. and weight is not neccesary a good thing. when the SE try to sell a heavy car, listen carefully. weight -> drink more petrol, only contribute to the inertia and momentum which can be good or bad. depends on what that car is for. :) stablility-> tyre grip, aerodynamics setup, suspension setup, centre of gravity.. just my thoughts.