2022-01-11 Kwontum Physics: Ground Reaction Force (GRF) on Dr Kwon Golf
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- Опубликовано: 10 дек 2024
- Young-Hoo Kwon, Ph.D.
Professor & Director, Biomechanics Laboratory, Texas Woman's University, Denton, TX
ykwon@twu.edu | kwon3d@kwon3d.com
drkwongolf.info
#Kwonified #KGRANDIOSE #TWU #Kinesiology #Biomechanics
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Dr. Kwon, you are giving away all our secrets.
Seriously, this this couple with any number of your previous videos provides as much as one needs.
Thank you Dr. Kwon! Your knowledge and expertise is a blessing to the golf community!
Amazing knowledge, Thank you for letting me understand how the forces work in Golf swing!! I'm definitely going to replay this video a few times to understand a few things, one thing I'm getting out of your work is don't be stagnant, move ,move ,move in the right format to get the most out of my forces!! I'm loving the slight move on front foot to start the swing this has helped me to get into rhythm like never before so Thank you for that ,I believe you call it a trigger, Awesome!
Please keep doing more videos Dr Kwon!
This is fantastic! Thanks a lot for your videos! Greetings from Europe.
Dr Kwon, I am a amateur golfer with a handicap index of 12.9 hoping to become a single figure in near future. I have been exploring different swing styles in past two years. I think that I naturally have a bit of re-center motion ie having my back facing the target while moving forward towards the target in the early part of down swing. I hit the balls longer whenever I do that. My driving distance of around 200 yards in UK winter is considered long for my handicap. I am so happy to find your channel and your theories explain the science behind it. I am now more confident in developing that feeling and I am gaining extra 10 to 20 yards. Thank you very much!
However I have a couple of questions for you:
1), I am not that consistent hitting iron with this style as it is not easy for me to move my center of weight forward enough in order to hit down on the ball. It is shorter time frame for iron shot. I have to adapt to much narrow stance for irons in order to turn better and keep my weight not too much back. Any advice on this?
2) Would you please do some videos re grips and club face etc? Now I get the distance going, I would like to have more consistence on direction.
Many thanks in advance!
Hi. I have the same issues as you. My driver got longer and better but struggling with irons. Any advice would be great.
Dr. Kwon is a genius. Everything about the golf swing is made simple. I have adjusted all aspects even my grip to accommodate these swing kinetics. IMPROVEMENT? YES INDEED!!!
As an engineer it is really interesting to get a scientific explanation of how the forces act during the swing. The next question is how these forces, and torques, translate to club head speed. I hope you will come to this later. Until then, keep up the good work 👏
In the long run, I will cover what happens to the body and club motion during the DS.
I love the stepping like Rhythm comment, make all the sense in what your teaching !! Perfect Ty!
Dr Kwon, great stuff. Working at it for a few days now and will follow your drills to help finally get to the body swing and away from arms only.
Have you ever heard of or worked with JJ Rivet who does work on biomechanics for members of the European tour and also with David Leadbetter?
Enlightening! Makes so much sense! I am a big fan of yours.
Thank you, Dr. Kwon. You can tell that you love to teach.
Very informative Dr kwon , if you understand what’s happening in your swing it seems it easier to perform it . Awesome
Thank you, Kwon-Gyo-Su-Nym for sharing this great info.
Haha!
Thank you Dr Kwon!
Amazingly helpful to better understand important parts of the swing - it seems the angle of hip is very important ? If yes what are the limiting factors - when is it overdone!
Brilliant !
Thank you very much for your work, it's very precious to me.
It's incredibly educational to see that the peak lead foot force is over 60% higher than the peak trail foot force. Intuition would wrongly suggest that pushing off the back foot would be strongest.
Now I understand your step and turn drill.
감사합니다
박사님^^
Incredible information. Sincerely, thank you.
would you do a short illustration on what most of us average golfers look like with our weak forces and torques? that would be helpful to compare and give insights. thanks
Sure!
Pure gold information 👍🏻
Amazing info 👌
Wonderful explanation, thanks very much!
I really want to get on his software and see what I’m truly doing with all my forces. I can get into mid 130s club head speed and want to control it to take advantage of the speed !
Fascinating!
Thank you very much.
So good. Thanks! 😀🏌️
Dr. Kwon, how is 'active backswing' related to torque generation explained above in overall swing power generation?
Thank you sir
I am just starting to understand the importance of the outward pressure of the feet to the ground, how do you train this down and outward pressure?
Thanks
Good Video
You have to push down anyways so just directing the push laterally outward should do. But to push good, you have to use the right leg to support your body in the BS. If the right hip moves backward quite a bit, you cannot use the right leg that well during the BS.
Great video! Could you explicate your 11 stages of the swing? Is each stage defined by the club position or hand/arm position or force min/max/inflection? Thanks!
From ED to BI, why is the combined vertical GRF decreasing when the dynamic weight of the golf club is increasing to about 100 lbs force? I would have suspected that the golfer would need to progressively push more into the ground to prevent that dynamic weight from pulling him off balance.
What is dynamic weight? I've never heard of it. Inertial force?
The equal and opposite pull force on the hands by the grip. Some would call it the centrifugal force.
Dr Kwon,
Their has been some training devices the is essentially a board that promotes a squeezing of both legs in backswing and downswing.
This action would create medial horizontal forces and not the preferred lateral. What are your thoughts?
Thank you for an excellent explanation of ground reaction force! Can you tell me if the torque applied to the ground by the trail foot also creates horizontal force?
To be precise, a torque cannot create a force. Instead, an off-center force creates a torque. The trail foot force (horizontal & vertical) participates in torque generation. It can add torque or cancel out a portion of the lead foot torque depending on the direction of the trail foot force.
Thank you for taking the time to answer my question and for the quick response! If the trail foot tries to rotate inside the trail shoe (toes moving away from the target)which resists, is it exerting a horizontal force relative to the target or torque with the ground and trail leg? I am examining ways to produce the horizontal force needed to tilt the direction of the reaction force.
@@JonathanTaylor63 By pushing to the right of the trail foot, a lateral force generated and propagating through a tiny bit of distance onto the lateral malleolus, resulting in a reaction torque at the medial malleolus.
fantastic
What is the greatest component of "unweighting" in this golfer? Is it the downward movement of the club and arms or a dipping of head and shoulders? I am interested in why some golfers dip and others do not. I can not understand how pushing up vertically after dipping produces club head speed as some claim (without giving evidence).
Lets make it simple. Unweighting means the force you are exerting to the ground is less than the body weight. So the key is not to push the ground as hard using your legs. This usually happens at the end of an upward motion or at the beginning of a downward motion. I will do an episode on this.
@@drkwongolf thank you, I look forward to that.
@@oldprogolf7292 And also, here is the link to a study we did: doi.org/10.1080/14763141.2019.1574887. In this paper, you will see significant correlations between force peaks and the clubhead speed, including the vertical peak in the DS.
@@drkwongolf this link is spring board diving?
@@daviddonofrio3229 Let me check the link again.
Would you please be kind enough to supply all the acronym names 1-11. I can see 6=Top Backswing, D=downswing and 10=Ball Impact, maybe 11=Move Forward?
1. BA: breakaway
2. MB: mid BS
3. LBA: late BS, [lead] arm-based
4. LB: late BS
5. EPR: end of pelvis rotation
6. TB: top of BS
7. EDA: early DS, [lead] arm-based
8. ED: early DS
9. MD: mid DS
10. BI: ball impact
11. MF: mid FT
12. LF: late FT
Superb Dr. Kwon, my son is in college studying Sport Science in Kansas and plays golf for the team, do you accommodate the swing analysis sessions over Spring Break, so he can get down there to see you? It will be great for his own swing and for him to gain a basic understanding of biometrics, which he want to pursue after college. Sent him your videos which is an education in itself!
When is his spring break? During our spring break (March 14-20), I won't be here due to a family trip.
@@drkwongolf I'm afraid his spring break is the same week, I will see when he can get down, it would be really good for him to experience.
@@markymark7044 Definitely!
So having a good recentering with pressure shift to lead foot would happen with good horizontal force. What other force reactions would you see?
What makes one golfer different from another is mainly what is happening in the frontal view. Both the horizontal and vertical interactions with ground matter.
Very interesting, how do we set up an appointment?
drkwongolf.info/swing_anal.html
If i understand this correctly it appears that the horizontal ground force along with simultaneous unweighting is the key to maximizing inclination. So if you have two golfers of same weight and stature, what is the one with more inclination doing to get more horizontal ground force? Is it just swinging back faster?
The direct outcome of a larger horizontal force is a larger lateral motion of the body. So if you allow more lateral motion of the pelvis (and the body above), that means you have more horizontal force.
Thank you,if you could show Ground Horizontal Force during the swing cycle that would be very helpful to see when its peaking,what’s happening during unweighting, etc
Can you explain why the GRF is low at impact? I thought it would be very high. thanks
It is because of the hard push during the downswing when the club aligns vertically. Your body moves upward as a result and the vertical force decrease toward the impact.
@@drkwongolf thank you!
Do I assume that this discussion is only about the "frontal plane" torque?
So far yes frontal plane only. The next episode will be on the horizontal plane torque.
the rope that you use to get a feel for your swing, how long is that rope.
7' or 5-6 iron length when folded.
Do the step drills promote a sqaure club face at impact?
that's my issue with this... It might be good at optimizing swing speed in good players but I doubt it will help with bad grips and lacking clubface control on lesser players (ie. me)... Still very interesting..
this has always been about promoting efficient use of effort in your golf swing. anyone concerned about this is already at an advance stage. in fact if you dont have your basic fundamentals down, this may hurt your game since it involves very dynamic weight transfers from lead to trail and back to lead. beginners may benefit more from stack and tilt which do in fact promote square club face and consistent low point control...at the cost of a limited power ceiling.
So, recentering motions in the properly performed swing would be the result of a proper administration of an outward trail side pushing force? The ground reaction force would be horizontal, pushing your upper body to the middle?
@@suivzmoi Beginners that want to improve should get a coach and NOT try to fix their golf swing by themselves. Get a coach you can collaborate with so you can build your own swing. A good coach will help you achieve using ground forces properly based on your own needs.
@@suivzmoi Agree 💯 %.
these series are to explain how and when the body movement generate most centrifugal force in a swing. you can substitute the golf club with an ax or a sword or a racquet and still obtain the same results.
so it is not about a golf swing but about how to make the most force out of your swinging.
I’m not sure this is helpful for the average golfer.
It’s very easy to get lost in the model which is a limited abstraction to gain insight.
The challenge for the teacher is to connect “feels with reals”! Different feels can go with the same “real”, regardless of the model for the “real”.
Good model!