2 ms·

Gravity of Earth

peter_d_sherman 5y ago
>"Latitude The surface of the Earth is rotating, so it is not an inertial frame of reference. At latitudes nearer the Equator, the outward centrifugal force produced by Earth's rotation is larger than at polar latitudes. This counteracts the Earth's gravity to a small degree – up to a maximum of 0.3% at the Equator – and reduces the apparent downward acceleration of falling objects. The second major reason for the difference in gravity at different latitudes is that the Earth's equatorial bulge (itself also caused by centrifugal force from rotation) causes objects at the Equator to be farther from the planet's centre than objects at the poles. Because the force due to gravitational attraction between two bodies (the Earth and the object being weighed) varies inversely with the square of the distance between them, an object at the Equator experiences a weaker gravitational pull than an object at the poles. In combination, the equatorial bulge and the effects of the surface centrifugal force due to rotation mean that sea-level gravity increases from about 9.780 m/s2 at the Equator to about 9.832 m/s2 at the poles , so an object will weigh approximately 0.5% more at the poles than at the Equator.[2][9]" PDS: My curiosity here, is does the Earth's gravity at the previously discussed locations (Poles vs. Equator) equally affect all materials? ? In other words, You have 100 tons of Cotton. You also have 100 tons of Iron... You make these weight measurements at the Equator. Now, when you move those 100 tons of Cotton and those 100 tons of Iron -- to the North or South Pole -- you'd expect that due to Wikipedia's logic, above, that both of those weights would not only weigh slightly more there -- but that the increase in weight (even though slight) -- would be equal and consistent between the Cotton and the Iron... But now, my question is, would they weigh exactly the same amount more -- or would that amount be slightly different, due to the materials being different? ? On the one hand, Iron might be affected by the Earth's magnetic field, especially at or near one of Earth's Poles -- whereas Cotton might not. But, if Iron is a bad choice (if we're concerned with Gravity and solely with Gravity) -- then what about other heavy non-Magnetic materials? Like, other heavy, yet non-magnetic, Metals? Would 100 tons of that, measured at the Equator, weigh exactly the same amount more as the 100 tons of Cotton would -- when both are measured again at one of Earth's Poles? Why or why not?

>"Latitude The surface of the Earth is rotating, so it is not an inertial frame of reference. At latitudes nearer the Equator, the outward centrifugal force produced by Earth's rotation is larger than at polar latitudes. This counteracts the Earth's gravity to a small degree – up to a maximum of 0.3% at the Equator – and reduces the apparent downward acceleration of falling objects. The second major reason for the difference in gravity at different latitudes is that the Earth's equatorial bulge (itself also caused by centrifugal force from rotation) causes objects at the Equator to be farther from the planet's centre than objects at the poles. Because the force due to gravitational attraction between two bodies (the Earth and the object being weighed) varies inversely with the square of the distance between them, an object at the Equator experiences a weaker gravitational pull than an object at the poles. In combination, the equatorial bulge and the effects of the surface centrifugal force due to rotation mean that sea-level gravity increases from about 9.780 m/s2 at the Equator to about 9.832 m/s2 at the poles , so an object will weigh approximately 0.5% more at the poles than at the Equator.[2][9]" PDS: My curiosity here, is does the Earth's gravity at the previously discussed locations (Poles vs. Equator) equally affect all materials? ? In other words, You have 100 tons of Cotton. You also have 100 tons of Iron... You make these weight measurements at the Equator. Now, when you move those 100 tons of Cotton and those 100 tons of Iron -- to the North or South Pole -- you'd expect that due to Wikipedia's logic, above, that both of those weights would not only weigh slightly more there -- but that the increase in weight (even though slight) -- would be equal and consistent between the Cotton and the Iron... But now, my question is, would they weigh exactly the same amount more -- or would that amount be slightly different, due to the materials being different? ? On the one hand, Iron might be affected by the Earth's magnetic field, especially at or near one of Earth's Poles -- whereas Cotton might not. But, if Iron is a bad choice (if we're concerned with Gravity and solely with Gravity) -- then what about other heavy non-Magnetic materials? Like, other heavy, yet non-magnetic, Metals? Would 100 tons of that, measured at the Equator, weigh exactly the same amount more as the 100 tons of Cotton would -- when both are measured again at one of Earth's Poles? Why or why not?