Would the force transferred from a punch get affected by gravity? I will describe my question using a scenario since I don't know exactly what to ask that will convey my question properly.
Let's say two identical faces were to get punched by a fist that generates the exact same amount of energy, 1000 joules. (same fist size, same impact point). The only difference being one of the faces is on earth, and the other is on a planet with much much higher gravity.
Once the fist has already hit the face and the energy has been transferred to the face, would gravity make a difference on that transferred energy? Assuming everything was identical up until the impact on faces, would gravity make a difference on how much damage each face takes? Would the face on the higher gravity planet take less damage, or would it be the exact same?
If gravity won't have any impact in this scenario, why not? Doesn't energy have mass and therefore affected by gravity?
 A: If somehow we are not putting in more energy during the punching, then I believe it would depend on the angle the punch makes with the horizontal. If you punch horizontal to the ground, the force of gravity won't do any work on your hand and you would land a blow without losing energy by doing work against the force of gravity as $W = F s \cos{\theta}$. Here the angle $\theta$ would be $90^\circ$ and so the work done against gravity would be zero. If you were to punch upwards, you would be doing work against gravity and hence would land a weaker punch and if you punch downwards, gravity would do positive work on your fist and you would land a stronger punch.
But all of this assumes the simplification that you put in all the energy at the beginning of the punch and your posture and physique has no effect on the punch which is obviously not true.
A: Let's say you punch with $1~\text{kN}$ force horizontally (perpendicular to gravity field), then gravity will have no effect on your punch. But if you punch vertically,- aligned to Earth gravity field, then punch and gravity forces must add to net force :
$$ F_{pv} = F_{ph} \pm m_{a}g $$
Where $F_{pv}$ is vertical net punching force, $F_{ph}$ - your "standard" punching force, i.e. in horizontal line, $m_a$ is about your forearm mass.
If for example your forearm has $2~kg$ mass, then gravity will "assist you" or will be stopping you by additional $\approx 20 N$ force, depending if you launch punch upwards or downwards.
