Question

is it true 1kg = 9.8 or 10 newtons?

Answer 1

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Answer 2

yes

Answer 3

On the surface of the Earth, the weight W of an object is related to its mass m by
W = mg ,
where g is the Earth's gravitational field strength, equal to about 9.81 m s−2. An object's weight depends on its environment, while its mass does not: an object with a mass of 50 kilograms weighs 491 newtons on the surface of the Earth; on the surface of the Moon, the same object still has a mass of 50 kilograms but weighs only 81.5 newtons.
http://en.wikipedia.org/wiki/Mass.

This says that 1kg=9.8 N

Answer 4

On earth. Yes
9.8 but in general it is rounded up to 10

Answer 5

it is 9.8
for convention it is taken as 10
since w=mg
and g at earth is 9.8m/s^2