This Microsoft Excel video shows how to convert kilograms (kg) to Newtons (N). This is done by finding the weight of the mass and assuming a gravity constant. Unless specified, the gravity constant is assumed as 9.81 m/s² which is the gravity acceleration of Earth. However if the mass is somewhere else you will need to know the gravity constant of that location, e.g. the moon where the gravity constant is instead 1.62 m/s²
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