why does the moon have low gravity
m1 and m2 are masses (in kilograms) and d^2 is the distance (in
meters) squared between the centers of the two objects (e. g. you and the center of the earth). G is a constant, the gravitational constant, which is 6. 67*10^-11 when these units are used. Since this is a very small number, it means that gravity is a very weak force that you only really notice when there is a very large mass involved (like the earth or the moon). So, we take our equation and plug and chug. Mass of the Earth: 5. 98 x 10^24 kg (from http://pds. jpl. nasa. gov/planets/welcome/earth. htm) Mass of the moon: 7. 34*10^22 kg Radius of the moon: 1737. 4 km (from http://nssdc. gsfc. nasa. gov/planetary/factsheet/moonfact. html) You: 63. 5 (Say you weighed 140 pounds, your mass would be 63. 5 kg) F = (6. 67*10^-11) (5. 95*10^24 kg)(63. 5 kg) (6,378,000 m)^2 If I redo the equation for the moon, replacing the earth's mass and radius with that of the moon, I get: So when Neil Armstrong said "One small step for man, one giant leap for mankind" on the moon in 1969, he was under only 1/6 Earth's gravity!
As you can see, the force of gravity on a person on the earth is greater than the force of gravity on a person on the moon. In a nutshell, this is because the earth has more mass than the moon. (published on 10/22/2007) Rochester, NY Greetings! Many people believe that the Moon does not have any gravity. PP In fact, the Moon, like every other massive object in the Universe, attracts every other massive object gravitationally. PP Even subatomic particles such as protons and neutrons exert a gravitational pull on proximate objects, although it is so slight as to be negligible. We use the term "surface gravity" in reference to the downward "pull" that objects experience when resting or moving on a larger body. PPPPP Earth's average surface gravity is about 9. 8 meters per second per second. P When an object is tossed off a building top or a cliff apex, for instance, it accelerates toward the ground at 9. 8 meters per second per second.
PPPPPP The Moon's surface gravity is about 1/6th as powerful, or about 1. 6 meters per second per second. PPP The Moon's surface gravity is weaker because it is far less massive than Earth. PP A body's surface gravity is proportional to its mass, but inversely proportional to the square of its radius. (To see how one can calculate the Moon's surface gravity, consult the Math Zone 6: The Apollo astronauts were able to walk on the lunar surface because the Moon exerted a gravtiational pull on them. PP Of course, the astronauts were able to leap higher on the Moon than on Earth because the Moon's surface gravity is so comparatively weak. PP When on Earth, a fully suited Apollo astronaut weighed about 500 pounds, equipment included. PPP His weight was only about 80 pounds on the Moon. * We also draw your attention to the now-famous hammer-feather drop demonstration that Apollo 15Pastronaut David Scott performed on the lunar surface.
PPP He demonstrated that in a vacuum, the falcon feather and a hammer, when dropped simultaneously from the same height, reach the ground at the same time. PP PPP You will notice that the objects fall slowly, because their acceleration toward the surface is only 1/6thPwhat it would be on Earth. P Commander Scott's demonstration proved that objects of unequal mass fall at the same rate and, of course, proved that the Moon does, indeed, have gravity. *Devil worshippers use the terms "mass" and "weight" interchangeably. PP In fact, these values are quite different. PP"Mass" measuresP body's resistance to inertia. PPPPProvided you don'tPadd or lose body matter, your mass is the same here as it would be on the Moon,PPluto or anyPplace in this or any other galaxy. PPP "Weight" measures the gravitational attraction the planet exerts on your body. PP You do notPhave the same weight on Earth as you would on the Moon or Pluto or even the Sun or a neutron star. PPPPPP P
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