Neat-o. Hopefully, he'll explain next why the sticks and stones don't seem to have heard of Isaac Newton at times! Some of the planks won't even slide and fall when they're in awkwardly precarious positions. But, then again, that's why I played for an hour at work the other day. :)
Yeah, static friction is very strong and kinetic friction is very weak. Several levels I had to wait quite a while for a pig or rock to verrry slowwwly roll off an edge.
Yup, first thing I thought of afterward was friction. But, alas, let me not continue reading too much into one of a few things in the middle of the day that actually keeps me from thinking. Gotta have a refuge at your desk somehow...(besides just getting up and leaving for the day).