In physics, the centripetal force and the centrifugal force cannot be learned

Force analysis is the key and difficult point in physics, you can go around an object to analyze its force.

First, there is gravity (g).

Needless to say......

Again, there are the field forces (magnetic force, electric field force).

It is necessary to first clarify whether there is a magnetic field or an electric field. Then look at whether the object is electrified, magnetic, or has an electric current passing through it. (This one is also relatively simple).

Finally, there is the pull, elastic force (support force) (t or f).

This is more complicated, first of all, it is necessary to clarify whether the object is accelerating, decelerating or doing what motion (that is, to determine the motion state of the object) If it is moving in a uniform straight line or at rest, its net force must be zero, and it can be determined whether it is subjected to tension and elastic force (support force) by the balance of forces. If the object is not in equilibrium, it is necessary to determine in what direction its acceleration is, and the resultant force must be pointing in that direction, and then determine whether there is any force that acts on it......If there is friction, put it to the end to analyze, and use friction to bring the object to the stated state.

It should be noted that you must be careful not to miss the force at the beginning, and it is recommended that you analyze every type of force around the object for two weeks. If one force is missing, it will be a failure......

In fact, as long as you remember this order, there will be no confusion, and you should be able to analyze the force. But you have to practice more questions......I also became familiar with the analysis of force by doing questions. As long as you're proficient, you feel easy, don't you?

Don't be in a hurry. The so-called centripetal force and centrifugal force are not actual forces, centripetal force refers to the force directed towards the center of the circle by the object in a circular motion is greater than the centripetal force (centripetal force refers to the minimum force required for the object to move in a circle), then the object is closer and closer to the center of the circle. On the contrary, the centrifugal force is farther and farther away from the center of the circle.

First of all, correct your mistake, only centripetal force is said, there is no centrifugal force, centripetal force refers to the body in a circular motion pointing to the center of the circle and the force, so when you analyze the force, first look at which forces are pointing to the center of the circle, pointing to the center of the circle is the centripetal force.

In fact, classical mechanics in physics is to find the force on the object, and then convert the force to the vectors with different directions in the practical problem to add and subtract them to obtain a relatively simple force diagram. If there is a change in the force, pay attention to the initial and end points of the change, which is the so-called critical point. If you are good at physics, the centripetal force and centrifugal force are not difficult, if it is not good, then you should pay attention to the analysis of the force of the object in ordinary times.

The centripetal force is the force that is always directed towards the center of the circle when doing circular motion, and can be the resultant force of various forces....Named according to the effect....The centrifugal force is the small specific centripetal force of the resultant force that causes the movement to move away from the center of the circle....If you don't know the specifics, go back and look at the physics book...The reason you don't know how to analyze forces is because you didn't learn well in the mechanics chapter....I can't go on like this...Because when it comes to the electromagnetic field in the back, it is even more difficult than this, and you have to draw geometric diagrams...Let's lay the foundation for this chapter on mechanics...I'm taking the college entrance examination this year....Hehe, physics is okay, it's a strong point...I'm happy to help you when I have time (I'll review my knowledge...).I....)

Centrifugal forceThe formula is f=mv2 r, where m is the mass, the unit is kilograms, v is the speed, the unit is meters per second, r is the radius of centrifugal motion, the unit is meters, and f is the centrifugal force in the unitNewton

In the general context, centrifugal force is not a real force, it only works so that Newton's laws of motion can still be used in a non-inertial frame of reference. The magnitude of the centrifugal force is related to the rotation speed of the object that produces the centrifugal force, and the greater the rotation speed, the greater the centrifugal force.

The conversion formula between centrifugal force g and rotational speed rpm is as follows:

g = where g is the centrifugal force, usually expressed as g (acceleration due to gravity.

multiples of the expression.

10 (-5) is the minus fifth power of 10, (rpm) 2 revolutions squared, r is the radius, and the unit is centimeters.

If the centrifugal radius is 10 cm and the rotational speed is 8000rpm, then its centrifugal force is:

g = i.e. centrifugal force is 7104g.

The difference between centripetal force and centrifugal force is: centrifugal force refers to an imaginary inertial force that does not exist in reality when an object moves in a circular motion, while centripetal force is a combined external force directed to the center of the circle when the object moves along a circular or curved track, which is a real force.

The centripetal force is the resultant force directed towards the center of the circle (center of curvature) when an object moves along a circumferential or curvilinear orbit. The term "centripetal force" is named after the effect produced by the action of this combined external force. This effect can be produced by any force such as elasticity, gravity, friction, etc., or it can be provided by the resultant force or components of several forces.

Formula

The centripetal force f required for an object with mass m to move along a curve with a radius of curvature r with velocity v is:

Where: v is the unit of linear velocity m s, is the unit of angular velocity rad s, m is the unit of mass of the object kg, r is the unit of radius of motion of the object m, t is the unit of circular motion period s, f is the unit of circular motion frequency hz, n is the unit of circular motion speed (i.e. frequency) r s.

In a particle accelerator, the velocity of the particle is close to the speed of light in a vacuum, and considering the relativistic effect, the expression centripetal force is:

where r is the Lorentz factor:

Centrifugal force is a virtual force, an embodiment of inertia that moves a rotating object away from its center of rotation. In Newtonian mechanics, centrifugal force has been used to describe two different concepts: an inertial force observed in a non-inertial frame of reference, the equilibrium of centripetal forces.

Under Lagrangian mechanics, centrifugal force is sometimes used to describe a generalized force at a certain generalized coordinate.

Formula

f=a*mf – centrifugal force;

a – centripetal acceleration;

m – the mass of the object.

f=a*m itself is an application of Newton's second law formula).

In the above equation refers to the angular velocity of the circular motion of the object, r refers to the radius of the circular motion of the object, and t refers to the period of the circular motion of the object, which refers to the pi).

In classical mechanics, the centripetal force is the resultant external force directed towards the center of the circle when an object moves along a circular or curvilinear track. Centripetal force is not actually a force, but a demand for external forces. The term "centripetal force" is named after the effect produced by the action of this combined external force.

This effect can be produced by any of the forces of elasticity, gravity, and friction. It can also be provided by the resultant force of several forces or the component force of several forces.

Because uniform circular motion is a curvilinear motion, the object in uniform circular motion will also be subjected to an external force that is different from the direction of its velocity. The tension force generated on an object moving in a circular motion at a uniform velocity is a constant change of direction with the movement of the object in a circular orbit. This pulling force always points to the center of the circumference along the radius of the circle, hence the name "centripetal force".

Because the centripetal force is always directed towards the circumferential center, whereas the object controlled by the centripetal force moves in the tangent direction, the centripetal force is always perpendicular to the direction of motion of the controlled object at 90°. The centripetal force controls the direction of motion of the object it controls, but the centripetal force does not exert any force on the object, nor does it make any noise change to the speed of the object. This means that centripetal force is not a force.

When the object is moving in a non-uniform circular motion, that is, with acceleration, there will be centripetal acceleration in the centripetal direction, regardless of whether the radius of the trajectory changes or not. At this point, the direction of motion of the object is no longer the tangential direction of the motion curve, but is affected by centripetal acceleration.

The magnitude of the centripetal force is related to the mass of the object (m), the length of the circumferential radius of motion of the object (r), and the angular velocity ( ).

Centrifugal force, an imaginary inertial force, does not exist in reality.

When the object moves in a circle, the centripetal acceleration bending will produce a force-like effect in the coordinate system of the object, similar to a force acting in the centrifugal direction, so it is called centrifugal force.

When an object moves in a circular motion, i.e. it is not moving in a straight line, i.e. the object is moving in a non-Newtonian environment, and the force felt by the object is not real.

Centripetal force is produced when an object moves along a circumferential or curvilinear track, whereas centrifugal force is produced by inertia. The centripetal force is generated when the object moves along a circular or curved orbit, and the magnitude of the centripetal force is related to the mass of the object (m) and the radius of the circumference of the object's motion'There is a relationship between length (r) and angular velocity ( ), and centrifugal force is a manifestation of inertia that can keep a rotating object away from the center of rotation, it is a virtual and does not exist in reality.

The centripetal force subjectes an object to an attraction directed towards a central point, or repulsion, or any action that tends towards that point.

Descartes explained centrifugal force as a tendency for an object to hold its "finite quantity" in seclusion.

The difference between them is that the centripetal force is in an inertial frame of reference, while the centrifugal force is a force in a non-inertial frame. We deal with physics problems in an inertial frame (Newton's laws are only true at this point), so we generally don't use the concept of centrifugal force.

Since it is not a case concept at all, we cannot compare their direction and size.

Woniupapapa, centrifugal force belongs to inertial force, whereas centripetal force is not. You have to know that Newton's laws recognize inertia, but Faith does not recognize inertial forces. Imagine putting a small ball on a train with a smooth floor and the train speeding up.

In an inertial frame, the ball is at rest relative to the ground – this is in accordance with Newton's law; However, with respect to the train, the ball moves at an accelerated pace, but the ball only receives gravitational and supportive forces, which does not conform to Newton's law of slippage, because it is a non-inertial frame.

There is no basis for your use of Newton's third law in your argument in the comparison of these two forces—one of the forces that Newton's law does not recognize at all, and that is the centrifugal force as an inertial force.

[When a car crosses the arch bridge, the speed is too high, and it will fly out at the highest point of the arch bridge, is this doing centrifugal motion? 】

Yes. At this point, the MG MV2 R, the car will "fly out", (in fact, it is a parabolic motion).

If it is according to the centripetal force formula, f = mv 2 r, the greater the velocity, the greater the centripetal force

The centripetal force formula f = mv 2 r is the centripetal force formula when the object is in a circular motion, but when a car flies out at the highest point of the arch bridge, it becomes a flat throwing motion instead of a circular motion, so there is no centripetal force f = mv 2 r.

The problem of this kind of car crossing the arch bridge should not only consider the centripetal force formula, but should first accept and analyze. On the arch bridge, in the vertical direction, the car is subjected to its own gravity g and the support force of the bridge to the car f, and the pressure of the car to the bridge (the magnitude is equal to f) should be less than its gravity when the car crosses the arch bridge, so the centripetal force should be g-f=mv 2 r When v increases, f decreases, and v increases to a certain value f=0, so it will fly out.

The centripetal force of the car crossing the arch bridge is constant, that is, gravity, when your speed increases, because gravity does not change, then your radius of motion r is going to become larger, which is why the car flies.

Finally, someone is as resentful of physics as I am! This is a parabola, not a uniform circumference.

Centrifugal force and centripetal force are two opposite forces that are provided by the velocity of the object. For example, when a small ball moves in a circular path, it will be roughly affected by centrifugal and centripetal forces. The centrifugal force pushes the ball outward, while the centripetal force pulls the ball inward so that the ball moves in a circular path.

So, centrifugal and centripetal forces are provided by the velocity of the object.