# Wall of Death in amusement park - Find number of revolutions

• BeatTheRuckus
In summary, the minimum number of revolutions per minute necessary to prevent riders from slipping down the Wall of Death in an amusement park is determined by the equation for centrifugal force. The radius of the vertical cylinder and the coefficient of static friction between the rider and the wall are given, and the riders' weight is not needed to solve the equation.
BeatTheRuckus
Here is the question:
The Wall of Death in an amusement park is comprised of a vertical cylinder that can spin around the vertical axis. The radius of the cylinder is 3.5 m and the coefficient of static friction between the rider and the wall is 0.32. Find the minimum number of revolutions per minute necessary so that the riders do not slip down the wall (enter rev/min).
I think I am doing it right, but I do not know

The vertical force you have to overcome is the riders weight.
The friction force is the normal force (force outward) * coef friction.

You just need to know the outward (centrifugal) force on a spinning object.

the thing is, I do not know the riders' weight/mass, or velocity

When you write down the equations something happens to the mass...
You do know the riders velocity, you have the radius and the rev/second - but you don't need it. Start by looking up the equation for centrifugal force

## 1. How does the Wall of Death in an amusement park work?

The Wall of Death, also known as the "motordrome", is a large circular structure with vertical walls that are used for motorcycle stunts. The riders enter the wall at the bottom and drive around the walls at high speeds, defying gravity. The centrifugal force keeps them on the wall as they make their way around the circle.

## 2. How do you find the number of revolutions made by a rider on the Wall of Death?

To find the number of revolutions, you need to know the circumference of the wall and the distance traveled by the rider. The circumference can be calculated by multiplying the diameter of the wall by pi (3.14). The distance traveled can be measured using a GPS or by timing the duration of the ride. Once you have this information, you can divide the distance traveled by the circumference to get the number of revolutions.

## 3. What is the average speed of a rider on the Wall of Death?

The average speed of a rider on the Wall of Death can vary depending on the size of the wall and the skill of the rider. However, most riders can reach speeds of up to 40-50 miles per hour on the wall.

## 4. How dangerous is the Wall of Death compared to other amusement park rides?

The Wall of Death can be considered a high-risk ride, as it involves riding a motorcycle on a vertical wall at high speeds. However, proper safety measures and training can minimize the risks. Compared to other amusement park rides, the Wall of Death may have a higher risk factor, but it is also a controlled environment with trained professionals supervising the ride.

## 5. What safety precautions are in place for the Wall of Death?

Safety is a top priority for amusement parks, and the Wall of Death is no exception. Riders are required to wear protective gear such as helmets and pads. The wall is also regularly inspected and maintained to ensure its structural integrity. Additionally, riders are trained and must follow specific rules and procedures while on the wall.

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