Originally posted by Cuauhtémoc1520
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Here are frames 313-315 supposedly highlighting that forward jerk you guys are talking about. However, it is important to observe the apparent motion of JFK, Jackie, and the car. Since, we can treat these three as a system of particles. Let's observe their motions, since they should act as a system in translation. Frame motions will be with respect to the previous frame.
Frame 312: Standard position, original frame of reference
Frame 313: Car moves Back, JFK moves forward(motion from previous shot to throat, Jackie moves back (camera thrust forward, thus creating backward illusion)
Frame 314: Car moves forward, JFK moves forward, Jackie moves forward (camera thrust back, creating illusion)
Frame 315: Car moves forward, JFK moves backward, Jackie moves forward(camera maintains position, stabilized to show true apparent motion)
Therefore, the idea that JFK gets thrust forward is false, and is an illusion due to rotation, and translation, of camera with respect to moving car. Frame 315 shows JFK being thrust back. The supposed forward thrust of Kennedy is an illusion, since camera jerks forward in 313 and since he had forward motion as result of earlier gun shot. Then, in frame 314, the camera jerks back, causing all three to appear to move forward. Therefore, you have a system which follows the following frame motion pattern: back, forward, forward. Except, JFK does not follow this pattern. His goes :forward, forward, back.
System(Car, Jackie): Back, forward, forward
JFK: Forward(from previous gun shot), forward, back
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