2007-02-05 12:25:09 · 5 answers · asked by Kiwi 1 in Science & Mathematics ➔ Physics
Well.. actually we DO experience such attraction. Every time you want to lift something you experience/feel some forece/resistance. When you lift some object you are literally "separating" it from the earth.
Why we don't see things attracting one to each other?.. Well they do attract!. just that this force is too small. But it can be measured.
F =(G * m1 *m2) / (r*r)
G is very small, G = 6,67 × 10-11 Nm²/kg².
Appeal between bodies can be obvious in those cases, A weight pending from a string shall be perfectly vertical, right?. Well if you are near a body which weight was big, let's say, a mountain, then it will deviate slightly from its vertical position and sightly pointing in the direction of that body. The deviation of a plumb in affinity of the big mountain was observed in time the first in 1775 in Scotland, by Maskelyne which has compared this all around the mountain.
Hope this help.
2007-02-05 13:13:35 · answer #1 · answered by MIGUELibre 2 · 0⤊ 0⤋
I think what you mean is why things as big as bread box, give or take, don't obviously attract. The simple answer is that they don't have enough mass. Mathematically speaking, it has to do with scaling. Take a solid sphere of a given density. The gravitation field intensity (the acceleration of a small particle toward it) at its surface due to its own mass is proportional to its mass M and inversely proportional to its radius R squared (M/R^2). Now imagine increasing R while keeping the density the same. M increases in proportion to R^3, so the field intensity increases as R^3/R^2=R. So, a ball made of "earth" 0.6 m in radius will produce a field 10,000,000 times smaller than at the surface of the earth (with R=6,0000,000 m). The amazing thing is that it can indeed be measured at all with sensitive equipment (google Cavendish Experiment).
2007-02-05 21:31:49 · answer #2 · answered by Dr. R 7 · 0⤊ 0⤋
The gravitational force between two terrestrial objects, in general, is very small and is overwhelmed with the gravitational force between an object and the earth.
2007-02-05 21:06:37 · answer #3 · answered by bozo 4 · 0⤊ 0⤋
In every movement and moment, you only have to observe, physics is all about the visable, observable universe. You only need recognize and comprehend what it is your experiencing.
2007-02-05 21:22:41 · answer #4 · answered by Anonymous · 0⤊ 0⤋
You haven't floated off the planet lately, have you?
2007-02-05 20:33:56 · answer #5 · answered by Anonymous · 0⤊ 0⤋