Why does an airplane do parabolic motion in a state of weightlessness

Buff.. It won't really be weightless, it's just that at the peak, the upward force and the downward force are just equal, and at that point, that is, the plane itself will be in a similar state of weightlessness, but inside the plane:

During the descent of the peak, if you are in it, you will feel a similar state of weightlessness, which is relative, relative movement. You are stationary relative to the airplane, at this time, you are falling, remove the plane, you are falling, and because the airplane blocks the air, it is not like parachuting,。。 The feeling at this time is indescribable, and LZ has the conditions to feel [next oh!]

If it's space, it's a different story!!

There may be weightlessness when the plane accelerates downward or wants to decelerate upwards, because the acceleration is downward, and acceleration upwards or downward deceleration is overweight, and the acceleration is upward.

Not only airplanes, but any object is weightless when there is no external force acting on it except gravity. To add, if there is a force perpendicular to the object itself at this time, it is also in a weightless state.

When doing parabolic motion, the acceleration is downward, that is to say, the resultant force of gravity and the supporting force is downward, that is, the supporting force is less than the gravitational force According to the definition of weightlessness, this is called weightlessness

The net force is downward, i.e. the supporting force is less than the gravitational force According to the definition of weightlessness, this is called weightlessness

The flat throwing motion is a uniform linear motion in the horizontal direction, and the vertical direction is a free fall motion, and the falling object on the plane is a flat throwing motion and does not fall in a straight line.

Throwing the ball is an oblique throw, which can be regarded as a kind of flat throwing, but the vertical direction is not a free fall motion, but a variable speed motion with an initial velocity of not 0 and an acceleration of g.

Whether it is a flat throw or an oblique throw, it is a parabola, and the trajectory of the movement is a parabola.

Hope it helps.

Falling objects on the plane do not fall in an oblique straight line, but also fall under a parabola.

The gravitational pull of the earth is the same, but the force is different.

The greater the velocity of the object during the fall, the more the object will maintain its original velocity and move in a uniform straight line when all the external forces disappear

So choose A

The so-called weightlessness means that the object is not acted on by gravity. The so-called gravity is a fraction of the gravitational pull of the earth that an object is subjected to.

force (magnitude is almost equal to gravitational force). The magnitude of the gravitational force is directly proportional to the mass of the fluid and inversely proportional to the square of the distance. In the case of a celestial body with a certain mass, the farther away an object is from it, the less gravitational pull it will experience, i.e., it will be heavier.

The smaller the force, the negligible gravitational pull at a sufficiently distance. But there is more than one celestial body in the universe, and the gravitational pull of many celestial bodies forms a gravitational field. Cause.

So, space will not be a weightless environment. Of course, in terms of local areas, such as in the Earth-Moon system, only the gravitational pull of the Earth and the Moon is considered, and it is on the ground.

At some point between the Earth and the Moon, the gravitational pull of the Earth and the Moon cancels each other out, and the gravitational force is zero. There is also a gravitational equilibrium point between the Sun and the Earth. A manned spacecraft flying around the earth is generally only from the ground.

There are hundreds of kilometers, and the space there will certainly not be a zero-gravity environment, and even if a spacecraft flies around the Earth at an altitude of 36,000 kilometers, the space around it will not be zero-gravity, but only light gravity, that is, gravity is greater than the Earth's surface.

The face is light. Use of airplanes as parabolic towns to fly or utilize.

Weightless towers designed on the free-fall principle can only provide a short-term sense of weightlessness. Spacecraft orbiting the Earth or interplanetary.

In a constant state of weightlessness during space navigation. In orbit orbiting the Earth, in fact, only the center of mass of the spacecraft is in zero gravity, its.

He is partly due to their orientation.

Effort and ground. The gravitational force of the sphere is not exactly equal to gain a microacceleration with respect to the center of mass, which is known as the microgravity state. Orbital control propulsion on spacecraft.

ignition, astronauts.

movement, the rotation of the motor.

and small aerodynamic drag, etc., will cause the spacecraft to produce micro-acceleration. Therefore, the weightlessness in which the spacecraft is located is strictly a state of microgravity. The rotation of the spacecraft destroys this state. In weightlessness, the human body and other objects.

It can float with very little force. Long-term weightlessness can cause the physiological effects of weightlessness in people. Weightlessness on spacecraft is associated with fluid flow.

The equipment has a big impact. The weightlessness conditions of aerospace can be used to carry out some scientific research and material processing that are difficult or impossible to achieve on the ground, such as the growth of high-purity large single crystals, the manufacture of ultra-pure metals and superconducting alloys, and the fabrication.

Take special biological drugs.

products, etc. Weightlessness provides favorable conditions for assembling structurally large spacecraft in space. The so-called weightlessness means that the gravity is zero, that is, zero gravity.