Beg to differ with you Ed...
F=MA is a force formula... the "delta t" or "change in time" determines the frequency of the force delivery (I called it "residence time" for people unfamiliar with mechanical engineering) but the "impulse" is the same as the "vibration" I mentioned.
The force delivery can be changed by surface area of delivery (fist shapes = contact surfaces) speed of the technique (punches or kicks) and the amount of "body mass" that is applied . There is also a factor in there for "base" (stance) as the "structure" of the body is essentially mechanical.
Another factor in force delivery is the response of the target...hard things break... softer things tend to absorb the force and distribute it based on their structure... i.e. a punch to the head vs. a punch to the rib cage vs. a punch to the stomach. I could go on and on, with the differing types of force response, but it's a lengthy discussion involving the body structure, striking angles, and contacted surfaces, including joint strikes, strikes to boney surfaces, strikes to "soft parts", vital point strikes... the list goes on and on.
Essentially, however, there are "snap" techniques (shocking power) and "thrusting" techniques (driving power), and they have different methods and mechanics... like there are formula 1 cars and dump trucks. They're both "cars" (for the sake of argument) but they are completely different, even though they work similarly... they have engines, tires, transmissions, etc. and require a driver. You would not, however, mistake either one for the other... as in "snap" vs. "thrusting".
The "swinging bag" test would do well for thrust kicks, but not so much for snap kicks. Their force delivery is also dependent on vibration and frequency, so an "absorber" like a heavy bag wouldn't really be a good measure of snap kicks. They sure do work well on a solar plexus, or a "shell vest", however...
, or a "soft tissue" area of the body with an "exposed nerve area".
There are a lot of factors that can be called into play in analyzing the differences, but "snap" vs "thrusting" is ultimately dependent on what you're trying to do, and how you're trying to do it.