New Amusement Rides Standard Aids in Measuring Water Slide G-Force. ASTM International's amusement rides and devices and committee (F24) has approved a new standard that will be used to collect gravitational force data for water slides.
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But speed alone isn't what makes a ride exciting. Consider this: On the average waterslide, riders splash along at 20 to 30 miles per hour. But the average airplane flies 600 miles per hour.
Heavier people will have more friction force and may slide slower. If the slide is long enough, a heavier person's higher momentum may allow a higher average velocity. I remember when I was a little kid, I was so light that I couldn't even slide on some slides that the bigger kids had no problem with.