I set up the grandkids slip-n-slide a couple summers ago.
Man, could they scoot.
However, when mass (somewhere between 180 to….say….. 247 lbs) meets wet plastic (at any angle, no matter how low to the ground you think you are) at the blazing speed of around 7.2 mph, I discovered that the friction of contact has much more holding power than yield. Seems water displacement is immediate, and actually enables one’s heels to make rare contact with the back of one’s head.
And……when a large area of glutinous hide does manage to slide several millimeters, the waterless friction gives one’s skin a healthy ruddy glow, lasting several days.
I did, however, find success in the ’slip’ part, at least with one foot, as my 2nd attempt, at a much greater velocity of 7.4 mph propelled one leg forward, extending my nether regions into a never before accomplished split.
Strangely, and simultaneously, I heard an eerily high pitched, ear splitting noise coming from some wild hyena-like animal quite nearby….my larynx being the exact location.
I was up and about in a matter of weeks.