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Physics-centripetal force, gravity, gravity and centrifugal force

The earth's gravitational pull provides the centripetal force and gravity of objects on the earth.

Centripetal force is caused by the rotation of the object and the earth together.

In addition to the centripetal force that kicks the dog, there is also an extra part, which is gravity. Just like if you pull something in a circle and use too much force, the object will move inward.

Centrifugal force is an imaginary force. It is a metaphor that when an object rotates, it seems to be moving away from the center of a circle under the action of a force. For an object moving in a uniform circle, the centrifugal force is equal to the centripetal force.

In fact, centrifugal force does not exist. He is just an effect. Just like women are attracted to men.