slig, uh-huh-- what do we got here, gang? [laughter] what do we got here? trouble. i've got a tablecloth. i've got a tablecloth with no lip, okay? - no. - watch this. those dishes are essentially at rest, aren't they? here's something for you to do this weekend when you finally get invited to your friend's house for dinner, okay? and the friend wants to know, what are you doing, what are you doing at school? you can kind of show him this, right? you don't wanna try this at your own house, not with your own dishes, okay? you might mess--but you try them at your friend's house. how about this, gang? what's gonna happen if i pull this thing very, very quickly, huh? what's gonna happen? -- let's try it. a one, a two, a three. and there you see newton's law flawlessly executed. at distinconetween-- that dtinction between weht and mass, i can kind of show you that kind of neatly with this device. what i'm gonna do is take this heavy ball-- heavy ball or massive ball? - both. - yes. both, yeah. see, i'm gonna take this ball. it's got a lot of mass, also has a lot of weight