That completely depends on their shapes, masses,
and positions relative to each other.
The center of gravity is an average of the location of the points of gravity. If you had a flying ring like a Frisbee but without the center, the center of the gravity would be in the hole.
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Since the atmosphere is more or less symmetric, its center of mass (center of gravity) gravity must be quite close to Earth's center.
Gravity works as a magnet to hold us to the ground.
No. For example, a ring has a center of gravity in the center of the ring, not on any part of the ring.
magnet
Not a magnet, no. But it does attract the Earth and this is due to gravity.
One way to know a coin is not silver is to check it with a magnet. If the magnet sticks to the coin, it is not silver. If the magnet does not stick, it still might not be silver. You can test it, but to do that you need a test kit.
gravity keeps the coin inthe middle when its stationary
The center of gravity of the truck
The center of gravity of the truck
No, but certain properties of gravity can simulated, using a magnet.
Lots of forces can counter gravity. For instance, when you are standing on the floor, the floor pushes you up, and thus counters the force of gravity. There are other options as well; for instance, if a magnet lifts a piece of iron, the magnet is countering the force of gravity.
The center of gravity is an average of the location of the points of gravity. If you had a flying ring like a Frisbee but without the center, the center of the gravity would be in the hole.
Take a simple bar magnet for example. Place an iron-like object near it and its attracted instantly. Place the object farther away and the object is influenced by less of the magnet's magnetic field. Similarly, the planet Earth, is a huge magnet. The magnetic field thus produced by the earth has an attraction of objects toward its center, i.e. gravity. The farther away from center of Earth you get(or the farther away from a magnet you put a metal object) the less attracted you or I become. So the higher in altitude from the surface of the Earth, the less of an effect gravity will have. Note that this change in gravitational effect is not a linear change, but logarithmic. In order to fully escape Earth's gravity, one would have to travel beyond Earth's Moon.
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important points about center of gravity