Post by dubiousgolfer on Dec 3, 2020 9:37:45 GMT -5
Here is a video by SMK explaining Newtons Law and how it can be misinterpreted in a golf swing.
twitter.com/i/status/1333958039049744387
DG
I did find point 5 a little confusing considering Dave Tutelman's article below (which does show a slight increase in clubhead speed) but SMK mentioned 'AT' impact not 'THROUGH' impact which is a slight 'play of words' in his question.
www.tutelman.com/golf/swing/accelerateThru.php
Simplified analysis #2 - Clubhead speed
Let's try another way of looking at it. What would the clubhead speed be immediately after impact, if the clubhead had not lost any momentum from impacting the ball?
Why would this matter? If the ball were not there, we have a speed before impact and another one 0.4msec after impact (i.e.- after separation). The clubhead speed that would be applied to the ball is somewhere between these two. So let's find both.
Case 1:
The clubhead speed coming into impact is 100mph. That is one of our original assumptions.
Since Case 1 is the case of zero acceleration, the speed 0.4msec later is still 100mph.
Case 2:
Again, by assumption, the clubhead speed coming into impact is 100mph.
We have an acceleration of 500 ft/s/s. Therefore, in the duration of impact, the change of velocity is given by the acceleration times the time the acceleration is happening:
Change of velocity = 0.0004sec * 500 ft/s/s = 0.2 ft/sec = 0.14 mph
Velocity 0.4msec after impact = 100 + 0.14 = 100.14mph.
So, out of a clubhead speed of 100mph, the acceleration gives us a boost of only 0.14mph. That's only than a 0.14% gain, and represents an extra 15 inches of distance on the drive. Note that it is the upper bound of the gain in ball speed that you could expect; the actual distance gain will be less. It is even less than Simplified Analysis #1; this one is probably negligible even for a long drive competitor. (Not zero, true. But negligible.)
twitter.com/i/status/1333958039049744387
DG
I did find point 5 a little confusing considering Dave Tutelman's article below (which does show a slight increase in clubhead speed) but SMK mentioned 'AT' impact not 'THROUGH' impact which is a slight 'play of words' in his question.
www.tutelman.com/golf/swing/accelerateThru.php
Simplified analysis #2 - Clubhead speed
Let's try another way of looking at it. What would the clubhead speed be immediately after impact, if the clubhead had not lost any momentum from impacting the ball?
Why would this matter? If the ball were not there, we have a speed before impact and another one 0.4msec after impact (i.e.- after separation). The clubhead speed that would be applied to the ball is somewhere between these two. So let's find both.
Case 1:
The clubhead speed coming into impact is 100mph. That is one of our original assumptions.
Since Case 1 is the case of zero acceleration, the speed 0.4msec later is still 100mph.
Case 2:
Again, by assumption, the clubhead speed coming into impact is 100mph.
We have an acceleration of 500 ft/s/s. Therefore, in the duration of impact, the change of velocity is given by the acceleration times the time the acceleration is happening:
Change of velocity = 0.0004sec * 500 ft/s/s = 0.2 ft/sec = 0.14 mph
Velocity 0.4msec after impact = 100 + 0.14 = 100.14mph.
So, out of a clubhead speed of 100mph, the acceleration gives us a boost of only 0.14mph. That's only than a 0.14% gain, and represents an extra 15 inches of distance on the drive. Note that it is the upper bound of the gain in ball speed that you could expect; the actual distance gain will be less. It is even less than Simplified Analysis #1; this one is probably negligible even for a long drive competitor. (Not zero, true. But negligible.)