The problem of weightlessness and overweight of the elevator, whether it is overweight or weightless

It's all weightlessness. Because the speed of the elevator rising and falling is uniform, the direction of its acceleration (g) and the direction of the acceleration of the human body are both downward, so they are both weightless. However, it is overweight at the moment when the elevator starts to rise, and the acceleration of the ascent is greater than the acceleration g of gravity

The elevator acceleration and extension is overweight, the deceleration and extension is weightlessness, the acceleration and descent is weightlessness, and the deceleration and descent is overweight.

Just saying that the elevator is stretched up or down cannot tell whether it is overweight or weightless.

When the ascent is just started, there is an upward acceleration, the human body is overweight, and it is neither overweight nor weightless after a slow constant speed, when it is almost to the top of the point, the elevator should slow down, and the acceleration is downward, so it is weightless.

In the same way, when coming down, at the beginning, it is necessary to accelerate downward and fall, and it is in weightlessness, and the slow uniform speed is not overweight and weightless, and finally it is necessary to decelerate and fall, and the acceleration is upward, so it is overweight.

In general, when up: overweight – neither overweight nor weightless – weightless.

Downward: weightlessness – neither overweight nor weightlessness – overweight.

Acceleration upward is overweight, and acceleration downward is weightlessness. The elevator is overweight when it first accelerates up or decelerates down; The elevator is weightless when it begins to accelerate down or decelerate up.

Stopping to start ascent and descent is overweight, stopping ascent and starting to descend is weightlessness.

You judge the direction of acceleration, upward is overweight, downward is weightless.

The situation of overweight and weightlessness in the elevator is as follows:

Overweight: acceleration ascent, deceleration decline;

Weightlessness: Acceleration descending, deceleration ascending.

Overweight, with upward acceleration.

f=ma, the direction of acceleration is the same as the direction of the force, upward, the direction of the resultant force is upward, that is, the resultant force of the supported force and the gravitational force is upward, that is, the supporting force is greater than the gravitational force, according to Newton's third law.

The pressure on the object below is greater than the force of gravity.

Weightlessness, with downward acceleration, f=ma, the direction of acceleration is the same as the direction of the force, downward, the direction of the resultant force is downward, that is, the resultant force of the supported force and the gravitational force is downward, that is, the supporting force is less than the gravitational force, according to Newton's third law, the pressure on the object below is less than the gravitational force.

Elevator overload generally will not damage the elevator to make Sun staring, overweight is directly not started, the elevator should be limited weight settings. However, if it is too heavy, the negative load of the elevator motor is too high and causes excessive heating, which will shorten the life of the motor.

Overload protection system trigger: The elevator is usually equipped with an overload protection system, when the weight of the elevator exceeds the rated load, the system will automatically trigger and stop the elevator operation. This is to protect the safety and stability of the elevator.

Premature damage to elevator components: When the elevator is overweight, the various components of the elevator (such as motors, wire ropes, wheel grooves, etc.) may be subjected to excessive negative nuclear loads, thereby accelerating wear and aging. This can lead to a shorter life of the elevator and increase the likelihood of elevator failure.

Affect the operating efficiency of the elevator: Elevator overload may also lead to a decrease in the operating efficiency of the elevator, such as the elevator running speed is slower, the stopping floor is inaccurate, etc.

The elevator is overweight when it is in a state of accelerated ascent.

Under the effect of transverse overweight (+GX), when visual impairment and brain dysfunction have not yet occurred, astronauts will feel difficulty breathing and chest pain. Some can also cause cardiac rhythm disorders and oxygen saturation reduction. Normal people can generally tolerate 10 12 g, and may tolerate higher g values with training and appropriate precautions.

There are several processes, first started by a standstill, which is accelerated, at this time overweight;

There is a uniform process in the middle, which is a state of equilibrium;

Later, to slow down, it is weightless. (The analysis here is the upward process, and the reverse is the case when it falls).

Overweight is a phenomenon in which the pressure of an object on a support (or the pull on a hanging rope) is greater than the gravitational force experienced by the object. When the object is in an upward acceleration motion or a downward deceleration motion, the object is in an overweight state, that is, no matter how the object moves, as long as it has an upward acceleration, the object is in an overweight state.

The elevator is overweight when it is in a state of accelerated ascent.

Downward acceleration is weightlessness, and downward deceleration is overweight;

Accelerating upwards is overweight, and decelerating upwards is weightlessness.

Upward deceleration can be understood as downward acceleration, and upward acceleration can be understood as downward deceleration, so you just need to remember that downward acceleration is weightless, and the rest of the comprehension should be remembered.

To do the elevator to accelerate up, the person has an upward acceleration, and the support force is greater than the gravity, so it is overweight.

Accelerated ascent Overweight.

Accelerated descent weightlessness.

<> subject to availability. When the elevator descends, it is necessary to accelerate downward at the beginning, the human body is in weightlessness, and after slowly and uniformly speeding, it is not overweight and weightless, and finally it is necessary to slow down and fall, and the acceleration of the pants is upward, so it is overweight. In addition, when the elevator rises, just start the base of the rise, there is an upward acceleration, the human body is in overweight, slowly after a constant speed is neither overweight nor weightless, when it is almost to the top, the elevator to slow down, acceleration downward, so weightless.

<> is subject to availability. When the elevator descends, it is necessary to accelerate downward at the beginning, and the human body is in a loss of beat, and it is not overweight and weightless after slowly maintaining a constant speed, and finally it has to decelerate and fall, and the acceleration is upward, so it is overweight. In addition, when the elevator rises, when it just starts to rise, there is an upward acceleration, the human body is basically in overweight, and it is neither overweight and weightless after slowly and uniformly, when it is almost to the top, the elevator should slow down, and the acceleration is downward, so it is weightless.

Overweight is the apparent weight greater than gravity, i.e., the supporting force is greater than the gravitational force. Weightlessness is the opposite.

Shouting to the scarlet to accelerate, A up, N>G, overweight.

Decelerate downward, same as above.

Deceleration and acceleration downwards towards Kaiye, a downward, n formula is always n-g=ma or g-n=ma (i.e., Newton's second law).

Note: n is the support force and g is the gravitational force.

Definition of overweight and weightlessness:

1.Overweight: A phenomenon in which the pressure of an object on a support (or the pull on a rope) is greater than the gravitational force on which the object is exerted is called overweight.

2.Weightlessness: The phenomenon in which the pressure of an object on a support (or the pull on a rope) is less than the gravitational force on which the object is subjected is called weightlessness.

Being overweight is the state you get when you go up when you do an elevator.

Weightlessness is the state you are in when you descend when you do an elevator.

For this physical phenomenon, we don't have to bother to memorize it; Just think back to the elevator ride. For example, from the low floor to the high floor, it goes through the process of overweight-constant speed-weightlessness. The elevator does upward acceleration - constant speed - upward deceleration movement respectively.

Perform a force analysis.

The concept of weightlessness: The phenomenon that the pressure of an object on a support (or the pull force on a suspender) is less than the gravitational force on an object is called weightlessness.

The object is acted on by two forces, namely the supporting force n and the gravitational force g.

When the elevator with acceleration g accelerates downward, the elevator floor does not have a force effect on the object, giving people the feeling that it is weightless.