Gravity on earth is 9.8 m/s squared, and gravity on the moon is 1.6 m/s squared. so if the mass of an object on earth is 40 kilograms, its mass on the moon is

The mass of an object on Earth is the same as its mass on the Moon. The weight is different.

Weight = m * g

Weight ( Moon ) = 40 kg * 1.6 m/s² = 64 N

If the mass of an object on Earth is 40 kg, its mass on the Moon is 40 kg and its weight on the Moon is 64 N. 

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