Line of compression and tangential force
 

I've been really trying to get into chapter 2 with in respects to physics to really get into Homer Kelley's mind further beyond than perhaps the text of the golfing machine itself and fully appreciate it.

It is my understanding (and ive just started studying this stuff so its very probable I've got the wrong end of the stick) that if you whirl a heavy object in a consistant orbit that the velocity and its mass (force) of the object being whirled around is always tangential to the point that the object is on the circle. Like if the string was cut - the ball would fly off at 90 degrees to the line of the centrifugal pull out.....

What is puzzling me is at impact the line of compression looks more down the angle of approach in picture 2-C-3 instead of down the tangent of the orbiting sweetspot. I would of thought the line of compression would be tangential to the orbit at the the point that the sweetspot travels through the ball.

Why also is in the picture 2-C-1, the line of compression pointing downwards at low point in comparison to the picture in 2-A?

Any ideas

I am no physics expert, but this little tidbit may help:

The hook-face alignment of the Clubhead – designed to give it the proper relation to the Plane Line – diverts the ball from its true tangential path.

Im not 100% sure either, this is sure interesting though :). It is 'my thoughts'(for what their worth until I become more educated on this)is that the orientation of the clubface gives the 'point of compression' but the line from that point onwards through the ball is the clubhead force which is tangential to the sweetspot orbit. If the point of compression is not in a vertical axis, you get what you see in diagram 2-B. Whats your thoughts?

Now looking again at diagram 2-C-1 whilst typing this post. I missed that the arrow for clubhead force is tangential in the low point but it looks as though the LOC took the clubhead force from the original impact point and perhaps why it points downward... which would make sence as it is the point that the compression or distortion took place.... very interesting indeed...

Matthew.2-C-3 is the application of linear force for THE LOB SHOT using vertical hingeing and its associated clubface layback.In 2-C-1 the LOC is pointing down because the clubface is travelling downwards during the impact interval.In my opinion 2-A is showing a simple explanation of resilince without the additional confusion of the conditions shown thereafter.Remember LOC is not the line of flight.It may help to read 2-A.

Just one thing, I've read this book and the whole of chapter 2, which surprisingly also includes '2-A resilience' so much I can just about quote it all by memory. When someone says 'it may help to read 2-A' it really bugs the hell out of me...

I actually mean't 2-C-1#3.... it was accidental... I did not mean the lob shot pictures of 2-C-3....

I know the line of flight and the line of compression are seperate. You must take me to be a real idiot or something... That was not what I asked.....

My question is why is the clubhead force going down the angle of approach like in picture 2-C-1#3 instead of off a tangent of the circular clubhead orbit.

If the string gets cut the ball flies out in a straight line directly away from the source of the centripetal force that is trying to pull it inwards.

Not going to get into the TGM part of it, because I don't have the book here to reference, but from a physics view point...

Be careful with the words you use. Mass is not a force, never will be. An object when travelling in a circle will have instantaneous velocity at a tangent to the circle, and instantaneous force (and therefore acceleration) towards the centre of the circle, in your case this force is tension in the string.

When one cuts the string, that force towards the centre of the circle gets removed, therefore there is no force (and therefore no acceleration) on the rock, so you are correct, it will fly off tangential to the circle.

Will expand on TGM side of it once I have the book in front of me (don't have the diagrams memorised yet..sorry)!!

Call the physics police
 

No it does not.

Just my 2 cents, but I thought the reason Homer drew 2-C-1 #3 that way was to illustrate that both the angle of approach and the arc of approach methods of delivery will give a straight-away golf shot.

In ideal compression, the ball will not leave the clubface instantaneously, but after the ball has reshaped. Then the internal forces causes the ball to propel along the line of compression. (2-A)

The diagram illustrates why we have to hit the inside-quadrant to get a straight shot. The distance in the arc is the distance the clubhead will travel during the time the ball deforms and reforms. (In reality, that distance isn't very long, just exaggerated in the diagram to give room to see everything.)

BTW, have to check my physics books, but the circular motion of an object gives it a tangental and radial force. The combination is why an object will go in a circle and not either drive into the center or fly off in a tangent. When the circular force hits an independent object, the force calculation on the ball would be (the mass of the clubhead) X (tangential acceleration)

A object travelling in a circle does NOT have tangential force.

Force gives acceleration. If it had tangential force it would go faster or slower around the circle.