bom,
i don’t understand what you mean by “if you’re a believer in physics, it slows to zero in order to match the stationary ball.” i don’t mean to hijack this thread, and if this topic has been discussed elsewhere, i apologize.
i come from more of a mathematics background than physics, so if you or anyone else can educate me, i’m all ears (or since this is an internet forum, all eyes). here is how i understand it:
let’s say a car is driving in a straight line at a constant velocity (i.e. zero acceleration) of, say, 30 mph, and a stationary object is in its path. if that object is light compared to the car, say a pylon or even a shopping cart, the car–as i understand it–will not slow to zero velocity. it will slow down (decelerate), but it won’t stop. perhaps it will slow to 25 mph or 20 mph. now if the object is much heavier than the car, say a very solid wall, then the car would slow to zero velocity (i.e. come to a stop). if you agree with me so far, let’s go on.
now let’s say the car is accelerating rather moving at a constant velocity. let’s say it’s accelerating at a constant rate of an additional 10 mph every second. so, one second after it was moving at 30 mph, it would be moving at 40 mph, and another second later it would be moving at 50 mph, and so forth. now if the stationary pylon or shopping cart is in its path, why does the car have to slow down? that is, why does the acceleration have to go to zero? why can’t the acceleration decrease from 10 mph every second to say 5 mph every second? as far as i understand, decreasing acceleration does not imply decreasing velocity. the car can still be accelerating, it’s just doing so at a lesser rate.
we can go even further. if instead of the car accelerating at a constant rate, let’s say it’s accelerating at an ever increasing rate. that is, the first second the acceleration is 10 mph per second, and the next second it’s 15 mph per second, and so forth. so now the car can even still be increasing it’s acceleration after a collision with a stationary object.
now, if instead of a car, let’s say we have an accelerating club head. i don’t know what the stationary golf ball would be the equivalent of. the pylon? the shopping cart? the wall? something in between? so are you saying that the stationary golf ball provides so much resistance that the accelerating golf club must not only decrease its acceleration, but also go to zero acceleration? i don’t know the answer, but i also don’t understand why in general you say it must be so. i’m not trying to pick a fight, i just don’t understand what you are saying.
william