The law of gravity
Here we think about why objects fall on the ground and about ways to allow objects to float in the air, that an object would no longer fall on the ground.
It says about our time: Eternal laws of nature are discovered by humans. The heaviness of the body he learns to pick up by wise arrangement.
The law of gravity
On this page, we explore the laws of gravity, weightlessness, gravity and equilibrium. We are looking are the laws of physics in the air and in the water, that apply to all Earth dwellers.
We study, how insects, birds, helicopters and planes can fly and stay in the air. We’re thinking about the world of tomorrow: flying cars, drones and … UFO’s? Will people, like IronMan, be able to move in the air with a suit, special shoes or flying skateboards?
A force is determined by point of force application, size and direction. It is represented by an arrow stretch. The length of the arrow stretch can be used to specify the size of the force, with the help of a force scale. The direction of the arrow corresponds to the direction of action of the force.
Forces acting in the same direction are added together to determine the equivalent force (resultant), and those acting in the opposite direction are subtracted from each other.
When two forces attack in different directions, the replacement force is determined by the force parallelogram.
Each force can be decomposed with known lines of action.
The weight force is a force, which presses a body on a support or pulls on a suspension, because of its mass.
- Gravity = The force exerted by two or more bodies on their own, due to their mass.
- This force of Earth is also called gravity. It is the cause of the weight of the body!
Newton’s law of gravitation
Newton’s law of gravitation is a physical law of classical physics, according to which every mass point acts on every other mass point with an attractive gravitational force. The gravitational is directed along the connecting line of both mass points and in their strength proportional to the product of the two masses and inversely proportional to the square of their distance.
Newton’s law of gravitation is one of the fundamental laws of classical physics. It was erected by Isaac Newton in his published book Philosophiae Naturalis Principia Mathematica from 1687. Newton thus succeeded in achieving the first common explanation for the gravity on earth, for the lunar orbit around the Earth, and for the planetary motion around the sun in the context of classical mechanics, which he founded at the same time by himself.
Newton’s theory of gravitation explains these and other gravitational phenomena such as the tides on Earth and orbit disturbances of the Moon and the planets with great accuracy. Remaining inconsistencies were not clarified until the beginning of the 20th century by the general relativity theory developed by Albert Einstein.
World’s firstbird-shaped drone causes a sensation
Drones have been used in any form for quite some time for a variety of purposes. One of these purposes is espionage. Even if this espionage is often only an insight into the neighbor’s garden, the developers of these drones are always more inventive. Now they have developed a mini drone, which comes in the form of a bird. Like a hummingbird, the drone appears in its flight behavior and appearance. Equipped with a camera, it can send things spotted during the flight to a receiver, where they will be displayed on a screen. The spy hummingbird was developed by the Californian company AeroVironment. This company has already developed the largest and the longest unmanned aircraft systems, the so-called GlobalObserver. The newly developed bird-shaped drone is referred to by the company as Nano Hummingbird. For quite some time now, the small drones, which are also used in the private sector, can excite the public. We’re already reporting, that privacy advocates will raise alarm via private drones.
Despite low weight, all necessary systems are integrated
The drones in bird shape measure a wingspan of about 16 centimeters and weigh despite their equipment only 19 grams. Despite the compact dimensions and low weight, the development team has been able to integrate all the necessary technical systems into the spy bird. These systems include the battery, the engine, a video camera and a communication system. If such a system were to come onto the market, surely many privacy advocates will cry out again. Especially since the design of the spy bird has been held, so that it can not be identified directly as a drone. Certainly, these drones are in no way comparable to the drones ordered by Google.
Good flight characteristics characterize the drone in bird from
The bird drone is able to take off and land vertically. Similarly, both the forward flight and the reverse flight is possible. Even looping is not a problem for the Nano Hummingbird drone. All functions are operated by remote controle. In addition, the transport of the video camera poses no problems for the flight behavior of the bird drone. Something similar to the hummingbird flying object was developed for the NAV (Nano Air Vehicle) program of DARPA. The tasks given by DARPA were partly surpassed by the Nano Hummingbird. It remains to be seen, what time will the Nano Hummingbird be pursued in the future and whether such a drone in bird form, will also appear on the market. Such a new developments show again and again, that the topic of privacy, apparently no longer exists.
Magnetic levitation trains – superconductors press on the gas
Once accelerated, a magnetic levitation train only prevents air resistance from sliding forever.
Superconductors are materials, through which electric current flows lossless, without resistance. However, this effect usually only occurs at very low temperatures. At the beginning of the 21st century, the temperature record for superconductors was minus 135 degrees Celsius, held by a substance called mercury-barium-calcium-copper oxide. The discovery of superconductors, which also work at room temperature, has not only revolutionized power transmission on overhead power lines, but has also led to a renaissance of traditional means of transport: the magnetic levitation trains.
Although the first experimental vehicles already exist around the year 1970, the magnetic lifting of the vehicles consumed a great deal of energy at that time. The new superconductors have changed that: All imaginable vehicles, for example children’s skateboards, are now hovering over permanent magnet tracks with no energy consumption. Once accelerated, a magnetic levitation train only prevents air resistance from sliding forever. Transport tubes in which there is a vacuum, could also eliminate this braking effect and allow speeds up to 6000 km / h.
Hyperloops – floating in the tube
Hyperfast transport capsules: Hyperloops bring passengers in 50 minutes from Paris to Berlin.
In principle, it’s the nothingness, that makes the Hyperloops so successful. The cigar-shaped transport capsules are in an almost evacuated tube and hover on a millimeter-thin air cushion at the same time, so that they touch the inner walls at no point. Due to the greatly reduced friction in partial vacuum, the means of transport requires a little energy: The electromagnetic linear motors run on less than one percent of the distance and still accelerate the capsules to 1200 km/h. The approximately 900 kilometers from Paris to Berlin can be completed in about 50 minutes.
The capsules are 135 cm wide, 110 cm high and can accommodate 28 passengers. They are sent on the journey every minute. Incidentally, the old-fashioned Name >>Hyperloop<< goes back to a concept by the American Elon Musk. By the beginning of the 21st century, the billionaire had organized the first private space flights and developed a battery-powered, hand-steered car, called “Tesla“. The world’s oldest hyperloop line between San Francisco and Los Angeles was his idea: Because Musk was annoyed with the construction costs and energy consumption of a planned high-speed railway line, he promoted the new technology.
Up in the air: Google co-founder Larry Page invests in flying cars
Flying cars, such as the prototype TF-X of the manufacturer Terrafugia could actually be built in the future.
According to a US media report, Google co-founder Larry Page has invested over $100 million in a company, that could build flying cars. In fact, several vendors are following this concept.
Google co-founder Larry Page apparently pursues the dream of flying – but with a car. According to the US magazine “Bloomberg Businessweek“, citing an insider, Page has invested over $100 million in a company called Zee.Aero. The company from Silicon Valley is currently working on a two-seat prototype, which is also suitable as a car and aircraft at the same time. The Zee.Aero team will include former employees of NASA and US aircraft manufacturer Boeing.
When cars learn to fly
As reported by “Bloomberg Businessweek”, the private investment should not have been the first of this kind by Larry Page. In the past, the Google co-founder has invested in the company Kitty Hawk, which also wants to realize the dream of the flying car. Even the chief developer of Google’s first self-driving car, Sebastian Thrun, have already been associated with Kitty Hawk.
Several companies around the world are currently trying to bring flying cars to production maturity and meet the licensing requirements of the authorities. In particular, the US company Terrafugia caused a stir last year with the prototype TF-X.