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Played 9 holes, shot a 39. Kind of got around. Everything between the trees, so in play. Short game was rusty. Got to get back on that. Greens were stupidly slow because they got a lot of rain yesterday and probably couldn't cut them down. Usually in the summer they are firm and pretty fast for how sloped they are. Got to work on face to path a bit. -
We agree here. Top of the car has a forward force, bottom of the car experiences a backward force via the braking. Both about the COM (somewhere in between). Result is a rotational flip. Since the forward force is still higher the car probably still globally travels forward. Sure, pretty basic. You really think there are deliberate twist forces applied? Like forcing the club head forward and simultaneously forcing grip end in the opposite direction? Heck I don't think we even slow down the grip end deliberately let alone force it the other way. Sorry, if I am missing something here. The orientation change is simple incidental because there is different rate of global movement of grip vs. clubhead throughout the swing. I also happen to think the best swings have the least amount of differential movement between the two end in the impact zone. In my defense, I never thought one could do justice in covering all aspects of a golf swing in a paragraphs or two to begin with. Especially not with grade school physics..😜 Okay. -
By cedrictheo · Posted
Wow, @DeadMan that is such a helpful breakdown of what’s around. Really excited to check a bunch of these out. Thank you. Will definitely go to Walnut Creek. Will also try and get a commonground tee time. Haven’t played many Doak courses yet! If your schedule frees up, let me know! -
Yeah. I'm not sure what Vishal is really talking about with the "constrained" COM. The club's COM doesn't really change much. Less than the body's does… We definitely apply force to the golf club to move it both translationally (linear force) and rotationally (torque) to the golf club. That's what Manzella's alpha/beta/gamma is all about. Even before they switched the reference frame from the global to the club-based one. 😉 -
Any time you apply a force to an object that is not directly through the COM, you're applying a torque. Take a car for example. If a car is moving and you hit the brakes, the only contact point is on the ground. The brakes make the tires slow down which applies a force backwards at ground level. Since that force is not applied directly to the COM, it also applies a torque, which makes the car rotate forwards. The suspension at the front applies another torque upwards to fight against that twist (because the ground is in the way). You can feel the front end of the car dip when you brake. Then, when you stop braking and that force is no longer applied, the tires stop applying that torque to the car and the car feels like it rocks backwards as the suspension evens itself out. That's all torques being applied. Ignoring the twist forces applied to the club leaves you way short of being able to describe the motion. Otherwise the orientation of the club would never change.
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