The speed and the height are not exhilarating for him, and many other children and adults feel the same way. It is absolutely normal for humans to be afraid of rides, slides and ball pits.
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Having a fear of a waterslide when you were a little girl is perfectly understandable, and human. Other people will have different fears, and may well criticize you for being afraid of something that they are not (or were not, as the case may be).
The Forces of NatureWhile each type of slide works a little differently, all water slides are fundamentally a product of three forces: gravity, friction, and inertia. Gravity forces passengers down the ride, while water acts as a lubricant to reduce friction, so the ride is fast and smooth.
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.
Gravity pulls the rider toward the Earth, helping to speed up their trip down the waterslide. Of course, friction also plays a part. Whether a person rides down the slide on their backs, a mat, or an intertube, the contact causes friction. This can slow the rider down.
In a typical coaster design, the riders in the front car get an unobstructed view of all these obstacles whipping past them. In a coaster that has seats facing backward, the rear car offers the best of both worlds -- you get a great view and the most intense ride.
High-speed roller coasters are more dangerous than water slides. Children are more likely to be hurt in a Go-Kart than a water slide. Water rides account for 20% of amusement park and carnival injuries.
How safe are rides? According to IAAPA, there are 0.9 injuries per million rides and that in a typical year, more than 385 million guests take more than 1.7 billion rides at about 400 North American fixed-site facilities.