Has gravity always been the same, a constant on earth?

Answer 1

No. In fact, gravity is not even the same everywhere on earth now, because earth is not a perfect sphere of uniform density. Local variations in the earth's mass and topography produce local differences in gravity (so you might expect to weigh slightly differently atop Mount Whitney than you would at the bottom of Death Valley). Also, the earth's gravitational field has not been constant over time due to changes and redistributions of the earth's mass and shape. The polar ice caps have pushed down the earth beneath them, flattening the poles compared with a perfect sphere. Even the tides alter the earth's shape and mass distribution on a daily basis. To the extent that the earth has accumulated meteorites and particles from space, its total mass has also changed over time. Since gravity is the attraction between two masses and a function of their relative distances, things which change the masses and their respective distances will result in corresponding changes in the measurement of gravity.

Answer 2

Two aspects of gravity interest scientists. Gravity has two parts the first is the static gravity field. It's relatively constant and won't or hasn't changed with time, There is evidence that there have been small differences in it. Secondly gravity isn't static. This too varies with time. Some processes inside Earth slowly cause the gravity field to change. A scientist named Dr. Watkins is the project scientist for the Gravity Recovery and Climate Experiment, also know as the Grace mission, it should be ready for launch this fall. Grace will make very precise measurements of Earth's gravity field. Which will inform us about the typography of ocean surfaces as well as which parts of the earth have fallen and which are rising. I suggest if you have a sincere interest in this science you check out the Gravity Recovery and Climate Experiment on the web. Have fun. Cheers! S

Answer 3

Yes,

Gravity is directly proportional to the amount of mass involved. You have gravity in the exact same proportion that the earth does but since the earth is so much bigger its gravitational force is much greater than yours. So, as long as the Earth has been as massive as it is now then the force of gravity has always been the same here.

Answer 4

The perihelion of the earth's elliptical orbit does precess, in part due to the slight tugs that the other planets exert on the earth as it orbits, but the precession of the planets' perihelions actually suggests that gravity is not a perfect 1/r^2 law.

Answer 5

As far as Earth has been the size it is currently, give or take a few hundredths. It may have been much greater before it collided with the planet that used to be between us and Mars. It may have been much greater at that point in relation to its size and speed but shouldn't change noticeably or we'd either be crushed instantly or ripped apart. Either way, you'll never know what happened.

Answer 6

1

Answer 7

yes it has, as long as the weight of the object is greater then the gravity pulling force it will always land back on earth.

Answer 8

yes 9.8m/s squared give or take hundreths, unless you mean earth mark 1, before the colison with the mars sized planet, then it was smaller, like 5 or 6, hope that helps.

Answer 9

YUP......g is a constant , remember?? so is graviational force(since f=ma)

Answer 10

Yes, I think so.