Post by dubiousgolfer on Jul 17, 2020 8:09:45 GMT -5
Dr Mann
I was wondering why there is such a distinct lack of anatomical detail to explain the 'kinematics/kinetics' of the golfer by many golf scientists like SMK , Dave Tutelman, Dr Kwon, Nesbit , etc. So I have revisited the definition of the terms below. It's almost as if the anatomical explanation (what muscles are being used to explain the kinematics/kinetics) is not included in the science of biomechanics.
It seems that the biomechanics on the 'kinetics' side is only considering the forces acting on the club but not the internal forces (ie. contraction of muscles) that move the body which , in turn, move the club.
I've added the definition of these terms below but what I meant above is exemplified in an article (also further below) involving SMK to explain clubhead speed generation. SMK fails to provide any further detail on how & when a golfer needs to create more hand force and torque rotation. It's just a blank statement to explain how to increase clubhead speed (via forces on the grip) which imho is of limited practical usefulness to a golf instructor.
For example , shaping the hand path to become more curved will increase the MOF and generate more 'torque of rotation' , but this isn't mentioned by SMK because he's just making his statement purely from a physics perspective .
I can only assume that 'SMK/DT/Nesbitt/Dr Kwon/Nesbit' have limited knowledge on the anatomy of the human body especially how the muscles can be used to optimise the kinematics/kinetics of the golf swing.
DG
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Biomechanics is the science concerned with the internal and external forces acting on the human body and the effects produced by these forces.
Kinematics vs. Kinetics:are sub-areas of biomechanics
Kinematics is the study of description of motion while kinetics is the study of explanation of motion. In kinematics, the focus is on the motion of the object, while kinetics focuses on the cause of motion dealing with the 'why.'
For example, in the study of golf swing, kinematics focuses on details of the swing 'motion' such as the shape of the clubhead path, positions of the body and club at various swing events, velocities of the body parts and club, and the timing of slow-down of the body for speed-up of the club. In order to describe the swing motion objectively, it is important to accurately measure the motion first. This is why measurement of the motion is one of the central aspects of kinematics. Basic kinematic quantities include time, position, displacement (distance), velocity (speed), and acceleration. In addition to these, shapes of trajectories of various points on the body, club and orientation of motion planes of various body segments and club are also kinematic issues. A complex motion of an object can be resolved into the linear motion of the center of mass (COM) of the body and the angular motion of the body about its COM, which is also a kinematic issue. (See the Linear Motion vs. Angular Motion page for the definitions of linear and angular motion.) The kinematic sequence plot is based on the angular velocity patterns of body segments, lines, and club.
Kinetics focuses on the causes of motion acting on the body: forces for the linear motion and moments of force (torques) for the angular motion. For example, there are largely two different forces acting on the club if we ignore the air resistance: the grip force exerted by the hands to the grip and the gravity (weight of the club). Since the weight of the club remains the same during the swing and always acts downward through club's COM, the grip force is the primary factor that influences club's linear motion. Hands also provide a moment of force to the club about the mid-hand point (a virtual joint that links the hands to the club) which influences club's angular motion. The hand-club interaction, thus, is a key aspect of golf swing kinetics.
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SMK article
rapsodo.com/the-science-of-speed-why-speed-matters-in-golf-and-how-you-can-improve-it/
Ok, so speed is important. Got it. What does your latest research tell us about how speed is produced in the golf swing?
I wanted to look at clubhead speed from the perspective of cause and effect. Let’s look at it from a Newton’s Law’s perspective. I chose a work-energy perspective and from a work-energy perspective, there are only 4 things that are going to determine how fast you get the club head moving.
The average force you apply to the grip in the direction that the grip is traveling.
The distance that you move that grip. We can call this the hand path.
How much you rotate the club through the swing
How much torque you apply through that rotation
From a physics perspective, a longer hand path, higher average force, more rotation and more torque, all will make you swing faster. Long Drive guys max out all of those things.
What I hoped to answer was what factor really separates one amateur golfer from another in terms of speed. What I found was that the average force you apply to the grip is by far the most important determining factor. Also the hand path length – the arc that your hands trace out – the bigger that is is the next important. The average torque you apply to the club is third. And the amount of rotation of the club is not very predictive of clubhead speed.
So what does this mean practically for the average golfer?
If the average golfer were able to increase their hand path by 4 inches in the backswing, they could increase their club head speed by 2.4 mph. It’s about what you’d get from lifting your lead heel and allowing your pelvis to rotate a little more.
You don’t have to lift your lead heel if you have the flexibility of an Adam Scott, but most amateurs don’t have the flexibility of an Adam Scott.
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I was wondering why there is such a distinct lack of anatomical detail to explain the 'kinematics/kinetics' of the golfer by many golf scientists like SMK , Dave Tutelman, Dr Kwon, Nesbit , etc. So I have revisited the definition of the terms below. It's almost as if the anatomical explanation (what muscles are being used to explain the kinematics/kinetics) is not included in the science of biomechanics.
It seems that the biomechanics on the 'kinetics' side is only considering the forces acting on the club but not the internal forces (ie. contraction of muscles) that move the body which , in turn, move the club.
I've added the definition of these terms below but what I meant above is exemplified in an article (also further below) involving SMK to explain clubhead speed generation. SMK fails to provide any further detail on how & when a golfer needs to create more hand force and torque rotation. It's just a blank statement to explain how to increase clubhead speed (via forces on the grip) which imho is of limited practical usefulness to a golf instructor.
For example , shaping the hand path to become more curved will increase the MOF and generate more 'torque of rotation' , but this isn't mentioned by SMK because he's just making his statement purely from a physics perspective .
I can only assume that 'SMK/DT/Nesbitt/Dr Kwon/Nesbit' have limited knowledge on the anatomy of the human body especially how the muscles can be used to optimise the kinematics/kinetics of the golf swing.
DG
-----------------------------------------------------------------
Biomechanics is the science concerned with the internal and external forces acting on the human body and the effects produced by these forces.
Kinematics vs. Kinetics:are sub-areas of biomechanics
Kinematics is the study of description of motion while kinetics is the study of explanation of motion. In kinematics, the focus is on the motion of the object, while kinetics focuses on the cause of motion dealing with the 'why.'
For example, in the study of golf swing, kinematics focuses on details of the swing 'motion' such as the shape of the clubhead path, positions of the body and club at various swing events, velocities of the body parts and club, and the timing of slow-down of the body for speed-up of the club. In order to describe the swing motion objectively, it is important to accurately measure the motion first. This is why measurement of the motion is one of the central aspects of kinematics. Basic kinematic quantities include time, position, displacement (distance), velocity (speed), and acceleration. In addition to these, shapes of trajectories of various points on the body, club and orientation of motion planes of various body segments and club are also kinematic issues. A complex motion of an object can be resolved into the linear motion of the center of mass (COM) of the body and the angular motion of the body about its COM, which is also a kinematic issue. (See the Linear Motion vs. Angular Motion page for the definitions of linear and angular motion.) The kinematic sequence plot is based on the angular velocity patterns of body segments, lines, and club.
Kinetics focuses on the causes of motion acting on the body: forces for the linear motion and moments of force (torques) for the angular motion. For example, there are largely two different forces acting on the club if we ignore the air resistance: the grip force exerted by the hands to the grip and the gravity (weight of the club). Since the weight of the club remains the same during the swing and always acts downward through club's COM, the grip force is the primary factor that influences club's linear motion. Hands also provide a moment of force to the club about the mid-hand point (a virtual joint that links the hands to the club) which influences club's angular motion. The hand-club interaction, thus, is a key aspect of golf swing kinetics.
---------------------------------------------------------------------------------
SMK article
rapsodo.com/the-science-of-speed-why-speed-matters-in-golf-and-how-you-can-improve-it/
Ok, so speed is important. Got it. What does your latest research tell us about how speed is produced in the golf swing?
I wanted to look at clubhead speed from the perspective of cause and effect. Let’s look at it from a Newton’s Law’s perspective. I chose a work-energy perspective and from a work-energy perspective, there are only 4 things that are going to determine how fast you get the club head moving.
The average force you apply to the grip in the direction that the grip is traveling.
The distance that you move that grip. We can call this the hand path.
How much you rotate the club through the swing
How much torque you apply through that rotation
From a physics perspective, a longer hand path, higher average force, more rotation and more torque, all will make you swing faster. Long Drive guys max out all of those things.
What I hoped to answer was what factor really separates one amateur golfer from another in terms of speed. What I found was that the average force you apply to the grip is by far the most important determining factor. Also the hand path length – the arc that your hands trace out – the bigger that is is the next important. The average torque you apply to the club is third. And the amount of rotation of the club is not very predictive of clubhead speed.
So what does this mean practically for the average golfer?
If the average golfer were able to increase their hand path by 4 inches in the backswing, they could increase their club head speed by 2.4 mph. It’s about what you’d get from lifting your lead heel and allowing your pelvis to rotate a little more.
You don’t have to lift your lead heel if you have the flexibility of an Adam Scott, but most amateurs don’t have the flexibility of an Adam Scott.
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