What's the difference between centripetal force and centrifugal force?

Centrifugal force and centripetal force are a pair of acting force and reaction force.

Centrifugal force and centripetal force are both important concepts in classical mechanics. Centrifugal force means that when an object moves in a circle, centripetal acceleration will produce a force-like effect in the coordinate system of the object, which is similar to a force acting in the centrifugal direction. It is an imaginary inertial force that does not exist in reality. The centripetal force is a real force, which points to the center of the circle when an object moves along a circle or a curved track.

Space-time is distorted due to gravity, so that matter has tension due to inertia, and tension is the extension of centrifugal force.

the field micro-gas energy material is internally rotated, and

the internal molecular meteorite satellite is constant.

high electricity or thermomagnetism is thrown outside, and

external centrifugal force is easy to vacuum.

centrifugal force and centripetal force are important concepts in classical mechanics.

centrifugal force means that when an object moves in a circle, centripetal acceleration will produce a force-like effect in the coordinate system of the object, which is similar to a force acting in the centrifugal direction. It is an imaginary inertial force that does not exist in reality.

The centripetal force is the combined force that points to the center of the circle when an object moves along a circle or a curved orbit, and it is a real force. Centripetal force and centrifuge are not a kind of physical work.

centripetal force and centrifugal force are two terms that physics students often confuse or misunderstand.

a typical misunderstanding is that the centripetal force points to the center of the circular trajectory of an object, while the centrifugal force is outward, as if they are acting in opposite directions. However, only one of them is real power!

centripetal force and centrifugal force

The only force that causes the circular motion of an object is centripetal force, which always points to the center of the circular path. For example, if a car turns a corner, the centripetal force that makes it move along a curve instead of a straight line is guided along the radius of the circle drawn by the car.

on the other hand, centrifugal force does not exist. Just like the "back to the future" magnetic flux capacitor, the term was invented to help describe something fictional, although it is based on some real observations. The effect of circular motion often makes objects feel as if they are flying outward, and the idea that an inward force causes this experience seems puzzling at first.

centrifugal force is a feeling

when the car turns sharply, passengers may feel that they have been "thrown" to the right side of the car. Passengers on roller coasters may feel pushed into their seats.

these feelings are the result of inertia; However, it is not a force (although it can be called an obvious force). Inertia describes the tendency of an object to resist motion changes, as described by Newton's first law of inertia.

when the car turns suddenly or the roller coaster rushes, the human body inside is already moving in a certain direction at a certain speed. According to the law of inertia, these objects initially resist the change of speed.

when the car suddenly started to drive to the left, the passengers were still moving forward in space-therefore, the car was not "thrown to the right", but crashed into the passengers from the left when the car suddenly moved. Once their bodies catch up and start to move to the left, the sense of impact is over.

similarly, in a roller coaster, when the roller coaster starts to push the body upwards, the body is still moving downwards. Until their bodies catch up with the new speed of the roller coaster, they feel as if they were thrown outside the cart. Their bodies are still moving towards the trolley, and the trolley is moving towards their bodies now.

how does centripetal force work

centripetal force is only a part of moving an object around a circle. Another factor is linear velocity. When the centripetal force is at right angles to the motion of an object, the object must be in motion so that it can move around a circle.

consider a ball at the end of the rope. For a person, to make it rotate around their head, they must first use the horizontal part (in other words, not directly enter or leave themselves). The man tightened the ropes and the ball began to spin around them instead of flying out.

in order to keep the ball on the rope spinning, two things must happen constantly: one must constantly tighten the rope (by pulling the rope), and they must constantly increase the slight horizontal thrust to keep the ball moving in a straight line, otherwise it will slow down due to friction with the air. However, in space, because the ball will not lose any linear velocity when it rotates in a vacuum, in space, people only need to pull the taught rope. )

If the ball doesn't move, and people tighten the rope, the ball will move inward instead of in a circle. If the ball moves directly from the person and they pull the rope, the ball will slow down first, then change direction and return to the person, which is also not a circle.

in this case, it is meaningless to call the force transmitted through the rope centripetal force. It's just a pull on the ball.

the source of centripetal force

the word centripetal force is only used to describe any force perpendicular to the linear velocity of an object. The interaction between many objects can provide centripetal force.

for example, as mentioned above, a rope rotating around a circle provides centripetal force to an object tied at the end of the rope. When the car turns, the friction between the tire and the road surface produces centripetal force. Because gravity provides centripetal force to the center of the earth, the satellite continues to move around the circle in orbit.

in each case, if the source of centripetal force suddenly disappears, rope, friction or gravity, the object will stop moving in a circle. More specifically, it will fly at any linear speed in a direction tangent to the circle.

centripetal force and centripetal acceleration

Because centripetal force points to the center of the circumference of an object

It turns out that the classical theoretical model can't explain centrifugal force at all! But centrifugal force is an unavoidable objective existence in real life.

Therefore, only by redefining centrifugal force and integrating it with theoretical system is an inevitable and feasible way.

why does centrifugal force necessarily exist and must exist?

The objective existence of a natural force is independent of human will, and all we can do is to prove its existence. Just as Newton proposed that gravity existed before, people could not accept that a force without contact could exist, but now people are used to accepting the existence of gravity, so we know that gravity does exist at a distance.

Centrifugal force is a kind of natural force concealed by Newton's centripetal acceleration theory. However, people can never explain some natural phenomena with Newton's theory, such as the reasons for the formation of planetary rings, such as the reasons for the stability of planets in orbit (so that it is necessary to assume that there is a virtual force to calculate the relevant quantities when launching satellites to calculate orbit and satellite speed), and even for gravity, it has not yet figured out what factors constitute it!

So centrifugal force actually must exist in the theoretical system!

however, the current situation is that it does not exist in the theoretical system and cannot exist.

the reason is that it is incompatible with the classical theoretical system, that is, the classical theory describes the phenomenon of rotating motion by accelerating motion, so the centrifugal force is covered up.

so, in order to save the position of centrifugal force, we can only build a new mechanical theory system for it. (Here we are not denying the value of classical mechanics, but developing a new theory to solve the existing problems)

The starting point of the new theory is to start from the law of inertia. Because the law of inertia is the core of the problem. Because the inertia law of classical theory describes inertial motion as the mode of linear motion of an object, the whole classical mechanical system is based on the study of linear motion of an object. Many questions, even almost all of them, have found answers from classical mechanics.

However, the world is dominated by circular motion, so it can be imagined that there must be many problems that have not been solved perfectly, and I don't know the true face of Lushan Mountain, but I am only in this mountain. Everyone didn't jump out to see it, of course, we couldn't find it strange!

so, we need to build a kinematic and mechanical frame of reference suitable for circular motion, which is the circular motion frame of reference. Because our classical mechanics uses Galileo inertial frame of reference, that is, the linear motion frame of reference, everyone thinks that there is only one frame of reference in the world.

However, the establishment of inertial frame of reference should have a basis! Galileo's inertial system is based on the law of inertia. How can an inertial system be established if the object under study is in inertial motion? How can it be called inertial system?

So the inertial system is also the key factor to establish the mechanical model.

none of this can be changed, but the understanding of inertial motion can be changed!

that is to say, some inertial motion can be different from that described in classical theory, that is, it can not be linear motion. Many people here may think that this is not a joke! How can inertial motion not be linear motion?

then let's start with the actual experimental basis.

You should know that the appearance of Newton's first law is closely related to an experiment of Galileo, that is, the inertia experiment of rolling a ball on the table.

Now the experiment is the same experiment, but the interpretation is different.

That is to say, Galileo's experiment of rolling a ball on the table is not the only one that can lead to the conclusion that the ball will definitely move in a straight line. We can get Newton's first law by removing the gravitational factor, which is an ideal theoretical model and proved to be very successful in practice.

however, Newton's inertial model is the result of abstract processing. What if it's not so abstract? The experimental result will be like this: it will rotate around the earth on the same level, that is, it will move in a circle.

based on this inertial motion model, it is absolutely possible for us to establish a circular inertial motion reference system!

circular motion is inertial motion, which is exactly the motion mode of celestial bodies in our universe!

in order to distinguish the classical concept of inertial motion, here we call this inertial motion under the action of balancing force.

since the circular inertial system can be established, the centrifugal force can settle down in it! It will work with gravity to make this home more perfect.

Then centripetal force and centrifugal force will have their own places, and literally they can be distinguished as the force tending to the center of the circle and the force deviating from the center of the circle, instead of saying centrifugal force as the component of centripetal force.

In the movement of celestial bodies, gravity acts as centripetal force, and centrifugal force is inertial centrifugal force. These two forces have played their respective important roles in the evolution of the universe, and both of them are indispensable. They have created this perfect world together. What we call gravity is also determined by them, so the greater the rotation, the greater the influence on gravity. At the lower latitude, the greater the radius of rotation, the greater the influence of gravity, because gravity is the resultant force formed by gravity and centrifugal force.

for details, please refer to the principle of inertia of everything in the universe.

what is the difference between centripetal force and centrifugal force? Centrifugal force is the starting point and centripetal force is the stopping point.

there is no centrifugal force, only centrifugal force

centrifugal force and centripetal force, just like tying an object to the other end of a rope, and then holding the rope in your hand to make the object fly without falling. An object will have a force to escape, which is called centrifugal force. If the object flies away as soon as it is let go, the centripetal force is the force to hold the rope by hand and prevent the object from flying away. So the two forces balance the object and rotate at a uniform speed. If you spin hard, as long as you don't let go, the object won't fly away, but it will speed up the movement in circles, and use speed to offset the centripetal force of the pulling force. Centrifugal force and centripetal force are that one wants to leave and the other wants to pull in, as simple as that.