What does gravity mean?
Question 1: What does gravity mean? 1. The attraction of the earth to other objects is gravity. The direction of gravity experienced by other objects is towards the center of the earth. 2. Generally, couples like to use the word "gravity" to describe their mutual attraction and their love as if there is gravity.
3. Yan Chengxu has a love song called "Gravity".
Question 2: What is gravity? Gravity: the mutual attraction force between all objects with mass. This force that the earth exerts on other objects is called gravity. The gravitational force exerted by other objects is directed toward the center of the earth. This is caused by the rotation of the earth. The rotation of the earth will produce a force called the geostrophic deflection force. In the northern hemisphere, it deflects the movement of objects to the right; in the southern hemisphere, it deflects the movement of objects to the left. So in the northern hemisphere, it is Counterclockwise, or clockwise in the southern hemisphere. According to Newton's law of universal gravitation, there is a gravitational force between any two substances with mass.
Question 3: Popular science: It doesn’t matter what gravity means. Imagine that if it does, then free fall at the equator and the North and South Pole should behave differently. , but in fact it is the same.
The gravity of the earth is actually the universal gravitation. As for the essence of universal gravitation, a relatively recent view is that the mass of the object causes the space to curve, thereby bringing the objects closer to each other. It is not appropriate to make an For example, if you put a shot put and a table tennis ball on a soft mattress, the mass of the shot put will cause the bed surface to sink, and the table tennis ball will move toward the shot put.
Note that the table tennis ball rolling toward the shot ball is only a superficial phenomenon. , the essence is that the spatial distance between the table tennis ball and the shot put is shortened due to the bending of the mattress. Imagine if the table tennis ball is replaced by a small wooden block, because of friction, although the wooden block will not move in the direction of the shot put, it will move in the direction of the shot put. The spatial distance is shorter than the moment when the lead ball is placed on the mattress (before the mattress has time to bend).
Question 4: What is the gravity of the earth? The magnetic field is mainly the dual magnetic field at the north and south poles, which originates from deep inside the earth. There are many theories about the origin of the earth's main magnetic field, among which the most reasonable explanation is the dynamo theory. This theory holds that the molten iron and nickel alloys in the outer core of the earth can flow, and the flow generates electric current; the generation of electric current also maintains the continued flow of matter, and this cycle continues, maintaining the existence of the main magnetic field. .
Where the earth’s gravity is strongest and weakest
If factors such as the rotation of the earth are taken into account, the gravity at the poles is strong and the gravity at the equator is weakest. This is why the latitudes of satellite launch centers are very The reason for the low value.
Without proof, we can give a theorem that the earth's gravity changes continuously. This is obvious. Then, the gravity at the center of the earth is 0, and the gravity at infinity is 0. Therefore, it can be proved that there is a place where the earth's gravity is the maximum. Where is this location? The place where the universal gravity excluding the centrifugal force of rotation has the greatest effect is on the metal mines at the two poles. . The North Pole is a vast ocean covered with ice and snow, and there are no mineral deposits on the surface, so the location with the greatest gravitational pull is the extremely large magnetite north of Rooker Mountain in the southern part of the Prince Charles Mountains in Antarctica.
As for where on the earth the gravitational force is the weakest, it can be seen from the above derivation that only the surface of the earth has the concept of "the place with the weakest gravitational force", which is the surface of the equatorial ocean. However, this point of the smallest gravitational force Its position is constantly moving with the tidal gravity of the moon, and it is constantly running around the earth. If the problem is extended to the entire earth, then the weakest point of gravity is at the center of the earth, where the gravity is 0.
The earth’s gravity may disappear
The British "Observer" reported: Scientists have discovered that the Earth's magnetic field, which protects us from deadly radiation from outer space, is rapidly weakening and may even disappear, indicating that the North and South Pole are about to shift. By then, powerful bursts of radiation that normally cannot reach the atmosphere will heat the earth rapidly, causing disaster.
According to Dr. Thomson of the British Geological Survey in Edinburgh, the Earth's magnetic field has disappeared many times before, which is a precursor to the translocation of the north and south poles. It occurs about once every 220,000 years, but recently it has It hasn't happened in nearly a million years, so it could happen again at any time.
Hulotgen, a scientist at the Institute of Geophysics in Paris, discovered that the magnetic field near the two poles has been disappearing at an alarming rate recently, clearly indicating that the two poles are about to change position, with the South Pole becoming the North Pole and the North Pole becoming the South Pole.
Based on the magnetic field change data recorded by artificial satellites over the past twenty years, Hulot discovered that the melt flow that generates the earth's gravity deep underground has a huge vortex near the North and South Pole, and rotates in a direction that strengthens the magnetic field reversal. , thus weakening the existing magnetic field, which will eventually lead to pole translocation.
Question 5: What is gravity? The earth’s universal gravitational force on objects. Since the earth is a sphere, its direction points to the ground spike, so it is called gravity. It is only in the center of the earth. It is not subject to the earth’s gravity
Question 6: What does gravity mean? 1. The attraction of the earth to other objects is gravity, and the direction of gravity experienced by other objects is toward the center of the earth. 2. Generally, couples like to use the word "gravity" to describe their mutual attraction and their love as if there is gravity.
3. Yan Chengxu has a love song called "Gravity".
Question 7: What does gravity mean? The mutual attraction force between all objects with mass. This force that the earth exerts on other objects is called gravity. The gravitational force exerted by other objects is directed toward the center of the earth.
This is caused by the rotation of the earth. The rotation of the earth will produce a force called geostrophic deflection. In the northern hemisphere, it causes objects to move in the right direction; in the southern hemisphere, it causes objects to move in the right direction. Left bias. So in the northern hemisphere it is counterclockwise, and in the southern hemisphere it is clockwise.
According to Newton's law of universal gravitation, there is a gravitational force between any two substances with mass.
The Earth itself has a considerable mass, so it will also exhibit gravitational pull on any object around the Earth. Take a cup as an example. The earth shows gravity to the cup at any time, and the cup also shows gravity to the earth. The mass of the earth is too large, so the gravitational force on the cup is also very strong, so it attracts the cup toward the center of the earth. This force is gravity.
Gravity is not equal to the earth's gravitational pull on objects. Due to the rotation of the earth itself, except for the two poles, objects on the ground at other places follow the earth in uniform circular motion around the earth's axis. This requires a centripetal force pointing vertically towards the earth's axis. This centripetal force can only be caused by the earth's gravitational pull on the object. To provide, we can decompose the earth's gravitational pull on the object into two components. One component, F1, points toward the earth's axis and is equal to the centripetal force required for the object to move in a uniform circular motion around the earth's axis. The other component, G, is the force exerted on the object by Gravity (picture) where F1=mw2r (w is the angular speed of the earth's rotation, r is the radius of rotation of the object), it can be seen that the size of F1 is zero at the poles, increases with decreasing latitude, and is the maximum F1max in the equatorial region. Because the centripetal force of an object is very small, under normal circumstances, the gravity of the object can be considered to be the magnitude of universal gravitation, that is, the effect of the earth's rotation can be ignored under normal circumstances.
Question 8: What is gravity? The earth's magnetic field is mainly the dual magnetic field of the north and south poles, which originates from deep inside the earth. There are many theories about the origin of the earth's main magnetic field, among which the most reasonable explanation is the dynamo theory. This theory holds that the molten iron and nickel alloys in the outer core of the earth can flow, and the flow generates electric current; the generation of electric current also maintains the continued flow of matter, and this cycle continues, maintaining the existence of the main magnetic field. .
Where the earth’s gravity is strongest and weakest
If factors such as the rotation of the earth are taken into account, the gravity at the poles is strong and the gravity at the equator is weakest. This is why the latitudes of satellite launch centers are very The reason for the low value.
Without proof, we can give a theorem that the earth's gravity changes continuously. This is obvious. Then, the gravity at the center of the earth is 0, and the gravity at infinity is 0. Therefore, it can be proved that there is a place where the earth's gravity is the maximum. Where is this location? The place where the universal gravity excluding the centrifugal force of rotation has the greatest effect is on the metal mines at the two poles. . The North Pole is a vast ocean covered with ice and snow, and there are no mineral deposits on the surface, so the location with the greatest gravitational pull is the extremely large magnetite north of Rooker Mountain in the southern part of the Prince Charles Mountains in Antarctica.
As for where on the earth the gravitational force is the weakest, it can be seen from the above derivation that only the surface of the earth has the concept of "the place with the weakest gravitational force", which is the surface of the equatorial ocean. However, this point of the smallest gravitational force Its position is constantly moving with the tidal gravity of the moon, and it is constantly running around the earth. If the problem is extended to the entire earth, then the weakest point of gravity is at the center of the earth, where the gravity is 0.
The earth’s gravity may disappear
The British "Observer" reported: Scientists have discovered that the Earth's magnetic field, which protects us from deadly radiation from outer space, is rapidly weakening and may even disappear, indicating that the North and South Pole are about to shift. By then, powerful bursts of radiation that normally cannot reach the atmosphere will heat the earth rapidly, causing disaster.
According to Dr. Thomson of the British Geological Survey in Edinburgh, the Earth's magnetic field has disappeared many times before, which is a precursor to the translocation of the north and south poles. It occurs about once every 220,000 years, but recently it has It hasn't happened in nearly a million years, so it could happen again at any time.
Hulotgen, a scientist at the Institute of Geophysics in Paris, discovered that the magnetic field near the two poles has been disappearing at an alarming rate recently, clearly indicating that the two poles are about to change position, with the South Pole becoming the North Pole and the North Pole becoming the South Pole.
Based on the magnetic field change data recorded by artificial satellites over the past twenty years, Hulot discovered that the melt flow that generates the earth's gravity deep underground has a huge vortex near the North and South Pole, and rotates in a direction that strengthens the magnetic field reversal. , thus weakening the existing magnetic field, which will eventually lead to pole translocation.
Question 9: What is gravity? Gravity: the mutual attraction force between all objects with mass. This force that the earth exerts on other objects is called gravity. The gravitational force exerted by other objects is directed toward the center of the earth. This is caused by the rotation of the earth. The rotation of the earth will produce a force called the geostrophic deflection force. In the northern hemisphere, it deflects the movement of objects to the right; in the southern hemisphere, it deflects the movement of objects to the left. So in the northern hemisphere, it is Counterclockwise, or clockwise in the southern hemisphere. According to Newton's law of universal gravitation, there is a gravitational force between any two substances with mass.
Question 10: Popular science: It doesn’t matter what gravity means. Imagine that if it does, then free fall at the equator and the North and South Pole should behave differently. , but in fact it is the same.
The gravity of the earth is actually the universal gravitation. As for the essence of universal gravitation, a relatively recent view is that the mass of the object causes the space to curve, thereby bringing the objects closer to each other. It is not appropriate to make an For example, if you put a shot put and a table tennis ball on a soft mattress, the mass of the shot put will cause the bed surface to sink, and the table tennis ball will move toward the shot put.
Note that the table tennis ball rolling toward the shot ball is only a superficial phenomenon. , the essence is that the spatial distance between the table tennis ball and the shot put is shortened due to the bending of the mattress. Imagine if the table tennis ball is replaced by a small wooden block, because of friction, although the wooden block will not move in the direction of the shot put, it will move in the direction of the shot put. The spatial distance is shorter than the moment when the lead ball is placed on the mattress (before the mattress has time to bend).