06-28-2023, 06:26 PM
(06-28-2023, 12:58 PM)m in sc_imp Wrote: having have slid a braked car along an iced road for an unusually long distance with the brakes locked i'd have to disagree.
I still think the car 'wins'.
mass will be a greater factor than coefficient of friction between the 2 examples.
5000 lbs car on 4 tires has less c.f. per "lbs" than a 1? lb puck with its full side dragging on the ice.
Coast, not brake. Coefficient of static friction is less than coefficient of kinetic friction and if the tires are flatish and there is other losses typical of a coasting car, the puck will go farther. Regardless, the point is that if you lower the deceleration of the lighter object by enough to overcome the mass difference, it'll go farther. It's just a question of the ratio of F/M. In the extreme, add a passenger in a car, repeat the experiment using the same (now heavier) car with brakes applied and it'll come to a stop faster even though the car has less mass. It's a question of degree.