On Newton's Gravity.?

Question

The law states that at great distances(as in light years distance), gravity comes into effect. But what happens what the size is a lot smaller, say, as small as a pea, and the distance is closer, say, ten miles? Is there any gravity pull going on?

Answer 1

People seem not to understand gravity, lol.

There are two models for gravity, and both are good. One was developed by Newton (Universal law of Gravitation, the other by Einstein (Special Relativity).

I'm not too familiar with Einstein's, so I'll describe Newton's:

F = GMm/r^2

F -> Force due to gravity
G -> a special constant in nature
M -> mass acting on the body
m -> mass of the body
r -> distance between the bodies


The law does *not* state that at great distances gravity comes into effect --it states quite the opposite. If r is the distance between the masses, then the farther out you get, the move division (And hence the smaller) your gravitational force will be.


So something the size of a pea, 10 miles apart, would have almost no effect:

M -> small
m -> also small
r -> big
G -> tiny

F = tiny*small*small/big^2

Small things multiplied by small things make smaller things, and smaller things divided by bigger things make even smaller things. Sorry mate, like this, it would practically do nothing --the effect would be so small, in physics we call these forces "negligable."

Answer 2

Gravity comes into effect no matter the distance... In the case of the peas and ten miles, assuming the experiment were to be performed on Earth, there would be gravitational attraction between the 2 objects. However, the gravitational attraction of the Earth itself, due to it's greater mass, is much stronger than the gravitational attraction of the 2 peas 10 miles apart. The peas would be pulled toward each other slightly, but they would be pulled a lot more toward the Earth, and the friction they experience at the same time would prevent them from moving toward each other. In an environment where there were no forces acting except for gravity, they would move toward each other as well as the Earth.

Answer 3

Everything in the universe which has mass generates a gravitational field. The field is directly porportional to the mass of the object. The greater the mass, the greater the gravitational field. Two objects generating gravitational fields experience an attractive force. The magnitude of the force is equal to the product of the masses times a very small constant factor and then divided by the square of the distance between each object. This means the force diminishes as the objects travel away from one another. However, the force is never zero. Scientists are trying to determine if there is sufficient mass in the universe to eventually pull it all back together at some point, or whether it will continue to expand forever. Reciently, a strange cosmic force has been discovered which works like anti-gravity. This force pushes matter apart.

Answer 4

first off. magnets have nothing to do with gravity. i dont know how old you are but when you take physics in high school or college you'll learn about newton's law of gravitation. the equation is...

F =G * (m1*m2)/ (r^2)

m1 is the mass of the first object
m2 is the mass of the second object
r is the distance between each object
G is the universal gravitation constant (6.673 x 10^ -11), its a VERY small number as you can see.
F is the force of attraction between the two objects

so there is a gravitational attraction between everything in this universe, even you and me, but since the earth is so massive that's all we feel. so yeah if you're 10 miles from a pea there is a gravitational attraction.

Answer 5

In order to answer your question a person needs to know why a field of gravity forms. First of all, Stephen Hawking in "A Brief History of Time," page 92, paragraph 3, states; "Like light, gravitational waves carry energy away from the objects that emit them." So, a field of gravity is a particular form of energy. This form of energy is described in the physics trilogy, which is: E = mc2, m = E/c2, and c2 = E/m. The last is that of a field of gravity or that of a field of time. It is an energy/mass relationship.

The form of energy spoken of in the equation is that of the heat energy contained within a mass. The greater the heat energy, the greater the field of gravity. Were a mass the size of our planet to have no heat energy within it, then it would have no field of gravity about it. Were the heat energy to increase, the force would increase.

Our sun expends 665 lbs/sec in order to keep the planets in place about it, and our planet expends 0.00444 kg/sec in order to keep us in place about it. There is an experiment that was performed a few weeks ago that proves a field of gravity is able to be formed and collapsed. It is found at http://youtube.com and the name of the experiment is "successful gravity experiment". It had to be posted in segments because of time restrictions, so it needs to be put back together. I'd take the time to go through this only if you had a particular interest in seeing the value of gravity being increased and decreased. Unless you have an intense interest in such things, it will be very boring. Read the introduction to the experiment in order to understand the reasoning behind what has been done.

As long as there is a mass, and the mass has an energy value c2 = (E)/m there is a field of gravity being formed.

Answer 6

Any two objects that have mass have gravity. However, the force exerted between the two bodies is reduced by the square of the distance between them. That is why when our astronauts are only a hundred miles or so up in space, gravity is seemingly non-existant (microgravity). When objects are very massive, however, like our sun, gravity is felt as far away as pluto and beyond.

Answer 7

SDS are you trying to say that gravity disappears when an external force acts opposite to it? Gravity is always there, it is always pulling on the paperclip (and the magnet). The magnetic force prevents the acceleration of the paperclip towards the earth.

To answer the question, yes there is gravitation, although it is so small that it is negligible.

Answer 8

Newton's Gravity.Well gravity is a chicken that tries to keep all the litlle chicks together. No matter how far they stray they always come back. So the closer the chick is the shorter the time to bring it back. The furthers away the longer it takes to bring it back.And its not easy when the farm is very big.

Answer 9

Anything with mass has a gravitional pull. Objects with more mass have more pull and the closer two objects are the stronger the gravitational pull. So a pea at 10 miles may have a gravitational force but its mass is so small that it is basically negligable

Answer 10

Gravity is variable. It may exist in another dimension. Consider a paperclip. Drop it and the mass of the Earth pulls it toward itself. Now, put a magnet close to the paperclip. The paperclip is held by the magnet, not pulled toward the Earth. Obviously the magnet is not as massive as the Earth. Where did the gravity go?