yes, this is true (if objects are accelerating at same rate, but (as i understand it) the delivery of power to an object also relates to the third law..equal and opposite reaction.
[BTW..the two objects u stated above might have equal force, but vastly different kinetic energy..if KE=1/2 mass x velocity (2) then (1) 10/2 x 20(2) = 2000, and (2) 20/2 x 10(2) equals 1000. however KE falls away at a geometric rate when forces of acceleration are applied....].
If u punch a small object, it moves. you punch a big object, you move...the inclination of an object, in this case you, to stay in current frame of reference, relates to the force (mass x accel) applied in both directions. a big guy effecting the same force (in the arm) as a small guy (in the arm) will deliver more, because a small guy (having less mass) will move more than a big guy (having more mass) away from the opposing object, and thus power delivered forward is lessened as puncher moves away...
he has less inclination to maintain frame of reference, therefore forces of accelration have more detrimental effect on his velocity and therefore, kinetic energy (KE= 1/2 mass x velocity(2)).
same way you will throw a ball 50 meters when standing on the ground, but will throw it 20 and move backwards if you are standing on a skateboard....the force generated is the same, but delivery is different as defined by your inclination to stay in motion (or still).
force = force in a specific moment, but acceleration relates to time and punches aren't instantaneous.
This all relates to you point that
however there is also the factor of follow through, you will generate more force by following through on your blows than by relaxing after contact..
my point related to the ability of objects to "follow through", and acceleration on objects of equal force but differing mass.
i think this is all true..but i've been known to be wrong.
