Final answer:
Fall protection is typically required when the fall distance is 4 feet or more, according to general safety standards. The severity of a fall is influenced by the gravitational acceleration, and therefore a safe fall could be six times higher on the Moon than on Earth due to the Moon's weaker gravity.
Step-by-step explanation:
In addressing the question about protection from falling, specifically when it applies to ramps, runways, and other walkways, it's important to adhere to occupational safety standards. These standards generally state that fall protection is necessary when the potential fall distance is 4 feet or more. However, this standard can vary by jurisdiction, and it's essential to refer to local regulations.
The question on the severity of a fall is more specifically a physics problem dealing with gravitational forces. The severity of a fall on different celestial bodies like the Moon and Earth depends on the acceleration due to gravity. Since the Moon's gravitational acceleration is approximately 1/6 that of Earth, a safe fall could potentially be six times higher on the Moon than on Earth, assuming all other factors are constant. In other words, an astronaut would hit the ground with less force after falling the same distance on the Moon compared to Earth.