Question

an object weighs 10 Newtons on earth what Unit Weight of moon .and also state arguency principle and also why do the object float or sinks when placed on the surface of the water

Answer 1

Weight of the object on earth is 10 newton
Assume g = 10 m per sq. second
So, w = m g
Or, 10 = m * 10
I.e m = 1 kg

Now, moon's gravitational force is 1/6 of earth
So w on moon = m * g
Or w = 1 * 10/6
Or, w = 1.66N.

Archimedes principle...
When an object has a density less than water it floats when more than water it sinks. Or,
When the bouyant force is less than object's weight the object sinks