Weight and agility are irrelevant, what matters are brakes and the coefficient of friction to the road surface.
I'm not convinced on this one. Agility yes, but the weight does matter.
What matters are brakes and the coefficient of friction to the road surface.
True, but, a heavy car will change friction figures resulting in longer stop lentghs. There are a lot of variables on how fast a car will stop, but generally speaking a heavy car needs more braking power.
Um, I really don't have time to give a physics lesson and in all honesty, whether you
are convinced is as irrelevant as the weight of the car in this instance.
If I tell you that if you are 6' tall and I drop a hammer from 38' above you that when it hits you in the head it will be traveling about 22 miles per hour, it doesn't much matter whether you are convinced, because it's still going to happen if you don't move out of the way. Period
Mass is part of the calculation of the frictional force and it's part of the calculation for the weight of the vehicle. It's on both sides of the equation. Thus, it cancels out. WEIGHT is completely irrelevant to how fast a vehicle will stop.
And you admitted as much by your second comment, that a bigger car needs bigger brakes. Duh. Did I say they didn't? What I said was that brakes matter and the friction between the road and the tire do...but weight does not.
Now you don't have to believe me (although I have no reason to lie to you here), go ask a physics teacher or even a TA, they'll walk you through it and show you the calculations as well. I know it's hard to accept logically, but unless you have a keenly astute mind -- which very few people do -- logic is not always your best friend. Logic probably convinced that teenage driver he was in control of the car, too. Facts proved otherwise. Physics don't lie.
Take care and enjoy the ride,