UK law aside, I have personal experience with slaps of both kinds.ramboondiea said:an open palm slap and back hand will generally do the same amount of damage, the difference usually being how much it hurts the attacker, an open palm slap will hurt more just because the palm is more sensitive, thats why it is easier to just backhand someone. but a i cant stress this enough, a slap can be just as dangerous as a punch, its just not as practical to use in a fight,
How? I do some Dominatrixing. A palm slap across the face hurts, but does no damage. A back-hand slap of the same force can split a lip and is likely to leave a bruise.
Now, I could see that it would be possible to do an open palm slap so hard that you do some damage with it - although damn, you'd need some upper body strength for that - but a back-hand slap is EASY to do damage without much strength. Knuckles suck like that.
Also, nails and rings can make an open-palm slap much more dangerous.
Anyway, the point being, I've trained a bit in how to cause pain without causing damage (or causing only the damage requested). If I seem to be splitting hairs about this slap thing, that's why. I've never assaulted anyone in an actual fight, so I don't have any knowledge of these things outside a very controlled environment, but I do know that, with a consistent force level, that open palms slaps do less damage than back-hand slaps, because your palm is a lot softer than your bony knuckles. It's like the difference between whipping someone with a soft leather tipped crop and a hard wooden switch. Both are similar tools, with similar leverage, used with the same force, but one (the wooden switch) does a lot more damage.
Oh, and for the record, I find talking about slap physics far more entertaining than talking about the fist fight of the thread topic.