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Speed-related forces: At extremely high speeds, the forces generated by acceleration, deceleration, and changes in direction would be immense. Humans can only withstand a limited amount of acceleration and deceleration before experiencing severe physical stress or injury. The human body would not be able to withstand the intense accelerations and decelerations involved in a 1000 mph roller coaster, even with significant safety measures.
Structural integrity: Constructing a roller coaster capable of sustaining the stresses and forces associated with a 1000 mph ride would require materials and engineering far beyond what is currently available. Building a structure capable of withstanding the extreme speeds and forces involved would be incredibly challenging and would necessitate breakthroughs in materials science and engineering.
Safety considerations: Ensuring the safety of passengers on a 1000 mph roller coaster would be immensely difficult. Despite advanced safety features and systems, the potential for accidents, mechanical failures, or human error would be vastly increased at such extreme speeds.
Comparison to aircraft: While aircraft technology has advanced to enable high-speed travel, it's important to note that aircraft operate in highly controlled environments with a qualified crew managing every aspect of the flight. In contrast, a roller coaster is a fixed structure operating on a predetermined track, introducing a greater element of risk at 1000 mph speeds.
In conclusion, designing a roller coaster that can safely travel at 1000 mph faces numerous technical, practical, and safety challenges that make it currently infeasible.