If a sledgehammer weighs 18 pounds on Earth and 4 pounds on the planet Namar?

The difference in weight of the sledgehammer on Earth and Namar suggests that the gravitational force on Namar is significantly weaker than that on Earth. Weight is the product of mass and gravitational acceleration, so the same object will weigh less in a location with lower gravity. To determine the exact gravitational force on Namar, we can use the ratio of the weights: if the sledgehammer weighs 18 pounds on Earth (where gravity is approximately 9.81 m/s²) and 4 pounds on Namar, we can infer that Namar's gravity is about 2.22 m/s².