I'm not sure if this is the right forum, but here goes. I was thinking about the physics of a slap, or a "slappy" feel where an impact stings on the skin but not much deeper than that. My question is what's going on there? I'm pretty sure it has to do with the rigidity of the object doing the slapping. In fact, that's the basis for the question. And more importantly is there any way of determining whether something will feel "slappy"? For example, my hand or even a rubbery mousepad will feel "slappy", whereas a computer mouse itself will not. But if I wrap my hand in a towel, it won't feel "slappy" whatsoever. I realize this is a little silly, but I'd like to know what's going on in terms of physics, forces and momentum.