What physics reveals about the JFK event

[Andrew Mason]

Ah yes the single frame of forward motion somehow takes precedence over the end result of the motion Lots of drawing from the review board folks and we all know how different those descriptions are than Parkland and Bethesda

 Where are all the nutters who believe that force in physics causes and equal and opposite reaction and like to show sheep falling towards the direction of the shot. They would of course say the initial forward motion is indicative of a shot from the front Such consistency from you folks

Do you mean physicists who have explained how a bullet that causes an explosive head wound can drive the head back in the direction opposite to that of the incoming bullet, because Newton's third law (for every action there is an equal and opposite reaction) requires it?

[Matt Grantham]

Perhaps you can distinguish for me when to apply the law of conservation of momentum as opposed to Newtons third law?

[John Mytton]

Jet Effect.







Also worth looking at is a comparison of the coconut explosion above and the following gif, and again we see a similar dispersal of matter.



JohnM

[Matt Grantham]

Firstly off it is interesting that no one is offering any clarification on Newton's laws and the absolute opposite interpretations that are being offered. Good old Aristotle and the law of the excluded middle is often a worthy ride at times such as these. Yes the good old jet effect. Never demonstrated other than with liquid or near liquid materials as far as I have seen. Also the jet is visible in the examples JM has offered The only jet we see from JFK's skull is heading upward so the jet effect should be driving him down into the seat. Just for the sake of ridiculous argument any such 'jet' would have come from JFK's right and therefore would have been driven back to his right

 I guess this is better than the twitch theory, but that is not saying much

 Jerry Organ said

Matter exploding out of skull creates a jet that pushes the head in the opposite direction: downward and backward after Z313.

 You would have need the right front of JFK's skull to have blown out completely to have created a jet effect that would have moved his head back and to the left. That didn't happen. You would have also needed to see a volume of jet material comparable to the examples given by JM. You would need to see a massive amount of material being blown out in the direction previously described Did not happen not even close.

[John Mytton]

The only jet we see from JFK's skull is heading upward so the jet effect should be driving him down into the seat.

Worth considering is JFK's upper body movement was restricted because of his back brace.



JohnM

[Matt Grantham]

Ballistic-wise, the brain is a liquid.

 Regardless you need to see the consummate amount of material. Not that I agree with giving you some authority to create alchemy through linguistics

Post-Z313, the head is driven downward, backward AND to the left. In other words, the opposite direction of the matter being forcibly expelled from the top right of the skull.

You seem to be ignoring the direction of the projectile Are you suggesting it turned in his skull?

What else would cause a one-frame forward motion and skull eruption, followed by a slightly-less severe backward-downward-leftward motion? Simultaneous bullet strikes from the rear and front?




 

That is easy Either two shots, or deceleration of the limo. There is also the ever lurking concern of alteration in the Z film though I find extremely unlikely that the forward motion at 312 could have been faked. It is possible that there may have been additional frames of forward motion after 312 and before 313.

Also I added some edits to my previous message that you might want to check out

[Andrew Mason]

Perhaps you can distinguish for me when to apply the law of conservation of momentum as opposed to Newtons third law?

Conservation of momentum follows directly from Newton's third law if you assume that the time of interaction is the same for both interacting bodies (which it is unless the interacting bodies travel at speeds approaching the speed of light relative to each other).  An action is a force for a certain duration. The "opposite reaction" is an opposite force for the same duration.  Force x time = impulse = change in momentum so if the two impulses are equal and opposite, they impart equal and opposite momentum so there is no change in total momentum: momentum is conserved.

The bullet has momentum.  It strikes the head.  The bullet loses momentum.  The head gains the same amount of momentum that the bullet lost - momentum has to be conserved (ignoring for the moment that the head is also connected to the body and, through friction, to the car). So the head starts to move forward as the bullet strikes the back of the head and plows through the brain. But then the head explodes sending brain matter in all forward directions.   So now the head and expelled contents must, together, have the same momentum that the head had before the explosive exit wound. This means that the head must recoil in the opposite direction to the ejected matter.  The forward momentum of the exploding brain matter (and the equal and opposite rearward momentum imparted to the head) is much greater than the forward momentum of the incoming bullet.  So in order to conserve momentum, the head has to recoil rearward with more momentum than the incoming bullet.  So the recoil from the explosive exit wound completely overcomes the forward momentum imparted by the bullet impact and sends the head backward.  This is seen in Chad Zimmerman's turkey shoot video in which he used jacketed bullets fired through pork ribs attached to the back of the turkey:
http://www.dufourlaw.com/JFK/Photos/turkeyribshot1a.mpg

[Andrew Mason]

You would have need the right front of JFK's skull to have blown out completely to have created a jet effect that would have moved his head back and to the left. That didn't happen.

The right side of JFK's skull opened.  His head was also turned to the left and he was leaning to the left. 

You would have also needed to see a volume of jet material comparable to the examples given by JM. You would need to see a massive amount of material being blown out in the direction previously described Did not happen not even close.

How do you know this if you have not worked it out?  See my earlier post using 100 grams of matter being ejected with 10% of the bullet energy. That is enough to send the head recoiling at 1 m/sec.