A10.0 kilogram mass of iron on earth exerts a downward force of 98 newtons. on the moon this same 10.0 kilograms of iron is weighed and found to exert a downward force of 16.3 newtons. how is this possible? a) the earth is farther away reducing the pull. b) weight is the same everywhere, but mass changes. c) mass begins to evaporate in the vacuum of space. d) the gravity on the moon is one sixth the gravity of earth.