why does not earth pull down at sum?

Question

according to newton forces between two bodies is same

so if we consider sun and earth ...both should hav same forces!!!!!

f=ma....as suns mass is hugh than earth so its acc should be less compared to earth in order to blance the force

and earth accelration should be very high
so y not earth gets pull into sun due to high vell


some says centifugal force acts on it but fro where centrifugal force is genrated
only forece genrated is gravitational force and that acts in center


plz solve this

Answer 1

The Earth DOES pull on the Sun. It pulls the Sun with the SAME force with which the Sun pulls the Earth. But since the Sun is much MUCH heavier than the Earth, that same force does not cause it to move as much. But it DOES cause it to move a little. The Earth does not exactly orbit the Sun, the Earth and Sun orbit each other around their common center of gravity. That is the place where, if you could put the Earth and Sun on a giant teeter totter, where the teeter totter would balance. Since the Earth is so much smaller than the Sun, that point is inside the Sun, but not exactly at the center of the Sun.

And the reason they don't fall into each other is their constant motion. Earth orbits the Sun at high speed around a large elliptical (almost circular) path. The Earth is trying to move off in a straight line but the Sun keeps pulling it toward it and causing the curving path. In effect, Earth is always falling toward the Sun but missing to one side because of its high "sideways" speed in orbit. The Sun does a similar motion, but going much slower, in a much smaller orbit, in the opposite direction. Another way to describe this is centrifugal force, but some people object to that explanation for what I think are overly technical reasons.

What causes the motion you ask? It is just coasting on momentum left over from its formation. It never slows down because there is no friction in space. Kind of like how you can slide pretty far on the ice without another push, because the friction on ice is so small. If the friction were actually zero, like in space, you would slide forever on the ice (only until you came to the edge of the ice of course).

Answer 2

True there is a force act on the Sun due to Earth's gravity. And there is a force act on the Earth due to the Sun's gravity. And based on newton's law of physics, g = GM/r^2 where G is the gravity constant, M is the mass of the object, r is the distance from the center of the object.

The acceleration due earth's gravity at the Sun, g1 = GMe/r^2
From f = ma, the force acted upon the Sun, f = GMsMe/r^2

The acceleration due to sun's gravity at the earth, g2 = GMs/r^2
The force acted upon the Earth, f = GMsMe/r^2

IF Earth and Sun is standing still from the beginning, they will fall to each other eventually due to the gravitational force. If there is no gravitational force, the earth would've been moving in a straight line and away from the Sun into deep space. From the Earth's velocity and the Sun's gravity, there produced a centrifugal force that maintain the earth distance from the Sun.

I hope I'm not too technical.

Answer 3

The orbiting speed of the Earth around the Sun is what keeps it from falling into the Sun. It is also what establishes the Earth's distance from the Sun. If the orbital speed were faster, the Earth would be farther from the Sun and closer to the Sun if it were moving slower. The density of the Sun is what creates the gravitational pull. A change in the mass of the Sun or Earth would have no effect on gravity or orbital distance as long as the total density remained the same. A good example of density verses gravity is the material in the middle of a black hole. A piece of this material the size of one cubic centimeter could weigh thousands of tons. Its mass is very small, but its density is tremendous, so its gravity is also tremendous.

Answer 4

The Earth has a whole lot of momentum that tries to keep it going in a straight line. The sun's gravity bends that line towards it so the Earth's path isn't straight, it curves. But not so much that it falls in. It's a bit of a balancing act; much less momentum and yes, the Earth would fall into the Sun. Much more momentum and it would fly away altogether. But it turns our that there is quite a wide range of momentums that work, because if the orbit curves in too much towards the Sun and it starts to get closer then that falling makes it speed up which straightens the orbit up again. Same deal in reverse if the orbit gets too straight. That speeding up and slowing down is why the orbit is an ellipse, not a circle, with the sun at a focus of the ellipse.

Answer 5

Newton did not say anything of the sort.
Gravity is proportional to mass. The more mass the greater the force of gravity. The Sun is millions of times larger than the Earth.

Answer 6

It is, but due to the fact that the earth is moving "sideways" relative to the sun it ends up missing it. So basically the Earth's orbit around the sun is the Earth eternally falling into the sun. Pretty cool huh?

Answer 7

You just said it yourself. The Sun's mass is huge, and so applying the same force to it results in much less acceleration.

Answer 8

Uh.....try looking at a size comparison.....if anything, we are lucky the sun doesn't pull in the Earth....