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 | Weight on Mars |  | Weight on Jupiter |  | Weight on Saturn |
 | Weight on Uranus |  | Weight on Neptune |  | Earth weight |
Weight on Mars: basics of physics
Let's imagine moving to Mars with our friend and two scales for a moment: a modern bathroom scale and a more traditional two-arm one. If we both go up on the latter, each on a different plate, the scale hangs on the side of the more robust, exactly as on Earth. Apparently, therefore, nothing has changed. Going up the classic bathroom scale, we realize, however, that our weight on Mars is very different from that on Earth. Why?
The weight of a body is the value of the gravitational force exerted on its mass.
The mass depends only on the quality and quantity of matter of which the body in question is made.
The mass, therefore, is identical wherever we are and that is why an object heavier than another on earth is also on the Mars. The weight, instead - being subjected to the gravitational force - is a variable entity:
Weight (N) = mass (Kg) by gravity (m / s2)
What we commonly call "weight" is therefore the force (of gravity) with which the Earth attracts us.
But what is gravity? It is a phenomenon whereby bodies attract each other with force proportional to their masses and inversely proportional to the square of the distance that separates them:
Gravity force = G (Newton's constant) x First body mass x Second mass
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(Distance between the two bodies) 2
Since the Earth is slightly flattened at the poles, the distance between a point on the earth's surface and the center of the Earth is different depending on whether you are at the equator (where it is greater) or at the poles (where it is less). Also for this reason (the effect of terrestrial rotation should also be considered) at the poles we weigh more than at the equator.
On Earth the gravity force is equal to about 9.81 m / s2 (1 g), while on Mars, being its mass lower than the terrestrial one, the gravity force is equal to (0.377 g). Our weight on Mars is therefore 2.65 times lower than on Earth.
PLEASE NOTE: by convention we express the weight in Kg instead of Newton (N) because in reality we translate this force into another unit of measurement, the "Weight Kilogram" (kg p or simply kg), which is approximately 9.81 N (1 g). Therefore, on Earth a man with a mass of 70 kg weighs (70 * 9.81) 686.5 N or 70 kg p (686.5 / 9.81). On Mars, on the other hand, the same man of 70 kg weighs (70 * 3.7) 259 N or 26.4 kg p (259 / 9.81).
