Question

If the Moon's mass is 1/80 of Earth's mass and its radius is 1/4 of Earth's radius, what is the ratio of g on the Moon to g on Earth?

Options

• 1/5

• 1/20

• 1/80

• 1/16

Answer 1

1/5

Explanation:

Using the ratio formula gₘ/g = (Mₘ/M) × (R/Rₘ)², we get (1/80) × (4)² = (1/80) × 16 = 1/5. This means the Moon's gravity is about 1/5 of Earth's.