Which force is responsible for the Moon's orbit around Earth?

• A. Electricity
• B. Friction
• C. Pressure
• D. Gravity

Answer: (D)

Gravity is the force that pulls masses toward each other. The Earth and Moon attract one another, and this attraction acts as a centripetal force that continually pulls the Moon inward as it moves forward. Because the Moon is traveling fast, this inward pull makes its path curve rather than letting it fly straight, so it stays in orbit around Earth. Space has very little friction, so there’s nothing to slow the Moon down and stop the orbit. The other options don’t fit: electricity would require significant charged forces at this scale and isn’t what governs the Moon’s motion; friction is essentially absent in space; pressure acts on surfaces in fluids or gases, not as a long-range pull shaping an orbital path. Gravity is the force responsible for the Moon’s orbit.