unbalanced force
No, that situation would not be considered an action-at-a-distance force. An action-at-a-distance force is a force that can affect an object without coming into direct contact with it, like gravity. In the case of the birds pulling on a worm, the force is being applied through direct contact with the worm.
Centrifugal
That is called a centripetal force.
clatrive
Centripetal force is the force toward the center of a circular path. It is often confused with centrifugal force, which is the force away from the center.
Neptune is pulling you toward itself right now, even as we speak. Not only that ! You are also pulling Neptune toward you, with exactly the same amount of force. I know you are. The way gravity operates ... there is a force between every two masses in all of Creation. The force is equal on both bodies, and in the direction that moves them toward each other.
The force that pulls an object toward earth also pulls the earth toward the object. The two forces are equal. Together, we refer to them as the force of gravity.
The pulling force that keeps us on Earth is gravity. Gravity is the force that attracts objects with mass toward one another. This force is what keeps us and everything else on Earth grounded.
Gravitational force pulling objects toward the center of the Earth. Magnetic force pulling magnetic materials toward each other. Tension force in a rope or string being pulled by two opposite forces.
The force being tested is gravity, which is pulling the object downward toward the center of the Earth. This force is responsible for the weight of the object and is a fundamental force in the universe.
Centripetal
The force of the Earth pulling things toward its surface is known as gravity. Gravity is what keeps objects, including us, grounded and gives weight to objects. It is a fundamental force in the universe that attracts all objects with mass towards each other.