b asked in Science & MathematicsAstronomy & Space · 1 decade ago

# if i weigh 100 kilograms on earth, how many kilograms will i weigh on the moon?

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Exactly the same assuming you mean kilograms-mass. Mass doesn't change even if the acceleration due to gravity changes. Your weight will change but your mass will not.

I sympathise with you saying that you weigh 100 kilograms on Earth, since I was brought up to think that way myself.

However, pedantic and persnickety SI system bureaucrats have taken over measurement in physics, resulting in a whole lot of quite obfuscatory book-keeping. Those bureaucrats will tell you that only your MASS (M) is 100 kilograms. They will then inform you that since WEIGHT is a FORCE, your weight (Mg_e) on Earth is approximately 980 Newtons (since 'g_e' on Earth is approximately 9.8 metres/sec).

On the Moon, the local gravitational acceleration 'g_m' is ~ 1/6th of 'g_e.' So your weight on the Moon will be ~ 980/6 Newtons or ~ 163 Newtons.

What that means, of course, is that your weight on bathroom scales on the Moon would be the same as that experienced by scales on Earth supporting a mass of only ~ 16.7 kilograms.

Live long and prosper.

• 4 years ago

Saturn and the Earth compared Saturn's diameter is about nine times greater than the Earth's It has 95 times the mass Despite Saturn's enormous size, its density is so low that if you were able to stand atop Saturn's clouds, you would feel a pull of gravity slightly less than what you feel on the Earth If you weigh 180 pounds on Earth, you would weigh only 165 pounds at Saturn's cloud tops Saturn is ten times further from the Sun than the Earth Saturn has the honor of being the second-largest planet in the Solar System, though it has only 30% the mass of its jovian better Jupiter. Like Jupiter, Saturn is blanketed by thick clouds and is believed to have no solid surface except for a relatively small, Earth-size core of rock and metals.

while it may be true that kilograms are not technically a measure of weight but of mass, still we use them as a measure of weight.

The person that said you would weigh nothing on the moon was dead wrong.

The gravity on the moon is roughly 1/6 that of earth, so your apparent weight would be 1/6 of 100 kilograms, about 16.7 kilos.

Of course, you would actually end up weighing more if you actually visited the moon, as you would have to wear a bulky spacesuit and carry oxygen tanks... so all in all, you might end up "weighing" the same amount.

Kilograms are a measure of mass rather than weight. As long as we are stationary on the surface of the earth the concept of weight and mass are related by a constant.

Things (including people) weigh about one sixth as much on the moon as they do on earth. The weight equivalent to 17 Kilograms of mass on earth is a reasonable approximation of your weight on the moon.

Dr Spock has your best answer here. Your mass is 100kg no mater where you are. You weigh ~ 980 Newtons on Earth and you'll weigh around 1/6 of that on the moon (~160N). The same you would weigh on Earth if you had a 17kg mass.

• eri
Lv 7

100 kilograms. Grams aren't a measure of weight, but of mass - not how heavy something is, but how much of it there is.

You will be weighing about 1/6 of what you are on earth.Then it is around 1/6*100=16.6666...... So it will aproximately be 17kgs .

The 1/6 is the derivation is derived from the formula g=MG/r^2.

• Anonymous