Certain brakes are designed to slow the train down to keep it within safe operating parameters, while other braking systems are used to stop the train completely at the end of the ride or in case of an emergency.
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Engineering a roller coaster brings together many engineering disciplines, including mechanical engineering to design, implement, and maintain the ride and ensure it is safe, and structural engineering to guarantee the attraction can withstand the elements.
Material – Wood and steel are the two primary materials used for roller coaster construction. However, steel is used more due to its versatility and ability to provide elements such as smoother rides and going upside down.
For a roller coaster, gravity pulls down on the cars and its riders with a constant force, whether they move uphill, downhill, or through a loop. The rigid steel tracks, together with gravity, provide the centripetal force needed to keep the cars on the arching path as they move through the loop.
The best place to sit on a roller coaster is the front row because it has both the greatest values of negative Z acceleration and the greatest time spent in free fall.
Designers test roller coasters with water-filled dummies. “It covers every aspect of coasters. The rides are tested with what we call water dummies, or sometimes sandbags.” The inanimate patrons allow designers to figure out how a coaster will react to the constant use and rider weight of a highly trafficked ride.
Programmable logic controllers, usually three of them, monitor every aspect of a coaster's operations. They regulate the ride's speed, ensure that trains never come too close to one another, and alert human operators to technical glitches or track obstructions.
Basic math subjects such as calculus help determine the height needed to allow the car to get up the next hill, the maximum speed, and the angles of ascent and descent. These calculations also help make sure that the roller coaster is safe.
In roller coasters, the two forms of energy that are most important are gravitational potential energy and kinetic energy. Gravitational potential energy is the energy that an object has because of its height and is equal to the object's mass multiplied by its height multiplied by the gravitational constant (PE = mgh).