How many newtons does a 3.8 kg backpack weigh on Earth and on the moon?

The newton (N)
is the unit of force in the SI system.  Weight is considered a force because it is the product
of an object's mass and the value for the acceleration of gravity acting on the
object.

Mass is the amount of matter in an object and does not change with
location.  Therefore, the mass of the backpack will be 3.8 kg on earth and on the...