Gravity on earth is 9.8 m/s2, and gravity on the moon is 1.6 m/s2. so, if the mass of an object on earth is 40 kilograms, its mass on the moon is__ kilograms and its weight on the moon is__ newtons.

First Blank: 40 kg, the mass of an object does not change. Mass is how much space an object takes up, therefore it does not change due to gravity.

Second Blank: 6.66 N. the gravity on the moon is nearly approximately 1/6 as Earth, so you just divide its normal weight on Earth, which is 40 kg, by 6 and fill it in.