why do objects balance at the center of gravity?

Question

why do objects balance at the center of gravity?

Answer 1

At the center of gravity, the gravitational forces are equally distributed on the object.
You must have unequal forces to produce movement in an object.

Answer 2

The center of gravity, also called the center of mass, is sort of an average over all the positions of all the tiny parts of something.

If you imagine breaking up something into a bunch of tiny pieces, (still held in their original place) and make sure each piece has the same mass. Now take an average of where all of them are, that would be the center of mass.

You could then imagine that when you try to balance this object that each of these little pieces are pulling downwards on the object and producing a "twisting force" or toque, pulling the object around one way or the other. The toque of each of these little pieces just depends on their position. (Technically is depends on the position and the weight, but each of these little pieces has the same weight.)

So if we add up all the torques, some of them on one side of the average and the others on the other side of the average, they all add up and cancel to zero.

The center of mass does not have to have equal masses on either side. Think of two kids on a see-saw, one with twice the mass as the other. The lighter kid has to sit twice as far from the center to compensate for his lower weight in order to balance. The center of mass (which is the balance point) is at the middle of the see-saw, but there is obviously more mass on the heavier kid's side of the see-saw.

Answer 3

Because the center of gravity is defined as the place where objects balance.

Answer 4

The true center of gravity is the exact point of equality. For example, a tight rope walker cannot just walk across the rope unassisted because the human's center of gravity will be very different for each person. Secondly, will require one's feel to be somewhat apart for true balance. The balnace rod, helps him to shift the center of gravity so it is directly over that rope..

Stand on one foot and you'll see your body is shifted slightly in the direction of the leg remaining on the ground, you are shifting your body so your center of gravity is over that leg.
Stand directly against a wall so you have no space between your shoulder and the wall. Lift the leg furthest from the wall and you probably will not be able to stand on one leg - you have no room to shift the center of gravity.

Answer 5

Because the mass in every direction outward from there is the same, thus balancing perfectly.

Answer 6

because all the wieght of the object in bieng concentrated there............ because gravitational pull is the greatest at that one point....... best example for this is the punching clown......... ull see that the cog is at a constant place....... the bottom of the clown

Answer 7

What else is there to pull them away?

Answer 8

because you have reach it the equilibrium all the forces have been annulled.