All things with a large mass such as the Earth have a gravitational force. Earth's gravity pulls down objects about 9.801 meters/sec.
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Gravitational force exerts an attraction on objects.
Gravitational force is weaker than other fundamental forces, such as electromagnetic and nuclear forces. Its strength depends on the masses of the objects involved and the distance between them.
Centripetal force is the force required to keep an object moving in a curved path. When an object is in orbit around a larger body, such as a planet, the centripetal force is provided by the gravitational force between the two objects. This is why the centripetal force in orbital motion is often equal to the gravitational force.
The strength of the gravitational force between two objects is directly proportional to the product of their masses. This means that the greater the mass of the objects, the greater the gravitational force between them.
The gravitational force then increases by a factor of 4 .