What science is rich in interesting facts? Physics!Grade 7 is the time when students begin to study it. To make the serious subject not seem so boring, we suggest starting the study with entertaining facts.
Why there are seven colors in the rainbow
Interesting facts about physics can even concernthe rainbow! The number of colors in it was determined by Isaac Newton. Aristotle was interested in such a phenomenon as a rainbow, and the Persian scholar was the one who discovered it in the 13th and 14th centuries. Nevertheless, we are guided by the description of the rainbow, which Newton did in his work "Optics" in 1704. He singled out the colors with a glass prism.
If you look closely at the rainbow, you canSee how the colors smoothly flow from one to another, forming a huge number of shades. And Newton initially identified only five basic: purple, blue, green, yellow, red. But the scientist had a passion for numerology, and so he wanted to bring the number of flowers to the mystical number "seven". He added two more colors to the description of the rainbow - orange and blue. So it turned out seven-colored rainbow.
Form of liquid
Physics is all around us.Interesting facts may surprise us, even if it concerns such a familiar thing as ordinary water. We are all used to think that the liquid does not have its own form, even a school textbook on physics says this! However, it is not. The natural form of a liquid is a sphere.
Height of the Eiffel Tower
What is the exact height of the Eiffel Tower?And it depends on the weather! The fact is that the height of the tower varies by as much as 12 centimeters. This is due to the fact that the building is heated in hot sunny weather, and the temperature of the beams can reach up to 40 degrees Celsius. And as you know, substances can expand under the influence of high temperature.
Selfless Scientists
Interesting facts about physicists may not beonly fun, but also talk about their dedication and devotion to their favorite business. During the study of the electric arc, physicist Vasily Petrov removed the top layer of skin at the tips of his fingers to feel weak currents.
And Isaac Newton introduced a probe into his own eye to understand the nature of vision. The scientist believed that we see because the light presses on the retina.
The quicksand
Interesting facts about physics can help to understandThe properties of such an entertaining thing as quicksand. They are a non-Newtonian fluid. A person or an animal can not immerse itself in quicksand completely because of its high viscosity, but it is very difficult to get out of it. To pull a foot out of quicksand, you need to make efforts comparable to raising a car.
In it you can not drown, but the danger to life is dehydration, sun, tides. If you get into quicksand, you need to lie on your back and wait for help.
Supersonic speed
You know what was the first device,overcoming the sound barrier? The usual shepherd whip. Clicking, frightening cows, is nothing more than a clap when you overcome the speed of sound! With a strong impact, the tip of the whip moves so fast that it creates a shock wave in the air. The same thing happens with an aircraft flying at supersonic speed.
Photonic Spheres
Interesting facts about the physics and nature of black holesare such that sometimes it is simply impossible even to imagine the realization of theoretical calculations. As you know, light consists of photons. Under the influence of gravity of a black hole, photons form arcs, regions where they begin to rotate in orbit. Scientists believe that if you put a person in such a photon sphere, then he can see his own back.
Scotch
It's unlikely that you were unrolling scotch in a vacuum, but scientiststhey did it in their laboratories. And found that when unwinding appears visible luminescence and X-ray radiation. The power of X-rays is such that it allows you to even take pictures of body parts! And that's why it happens - a mystery. A similar effect can be observed when asymmetric bonds in a crystal are destroyed. But that's bad luck - there is no crystalline structure in Scotch tape. So scientists will have to come up with another explanation. Do not be afraid of unwinding the tape at home - no radiation occurs in the air.
Experiments on people
In 1746, a French physicist and, according topart-time, the priest Jean-Antoine Nollet explored the nature of the electric current. The scientist decided to find out what the speed of electric current is. That's just how to do it in a monastery ...
The physicist invited 200 monks to the experiment,connected them with iron wires and discharged the poor battery from the newly invented Leyden jars (they are the first capacitors). All the monks reacted to the blow simultaneously, and this made it clear that the current speed is extremely high.
The ingenious devil
Interesting facts from the life of physicists can be submittedfalse hopes for the failing students. Among the negligent pupils there is a legend that the famous Einstein was a real twelve-man, he did not know mathematics well, and in general he failed the final exams. And nothing, became a world famous scientist. We hasten to disappoint: Albert Einstein began to show remarkable mathematical abilities in his childhood and had knowledge that far exceeded the school curriculum.
Perhaps the rumors about the poor academic performance of the scientistarose because he did not immediately enroll in the higher polytechnic school of Zurich. Albert brilliantly passed exams in physics and mathematics, but in other disciplines he did not score the required number of points. Bringing up knowledge of the necessary subjects, the future scientist successfully passed the exams next year. He was 17 years old.
Birds on the wire
Did you notice that birds like to sit on wires?But why do not they die from electric shock? The whole point is that the body is not a very good conductor. Bird's legs create a parallel connection through which a small current flows. Electricity prefers the wire, which is the best conductor. But it is worthwhile for a bird to touch another element, for example, a grounded support, as electricity rushes through her body, leading to death.
Hatches against cars
Interesting facts about physics can be recalled even intime watching the city racing "Formula 1". Sports cars are moving at such a high speed that a low pressure is created between the bottom of the car and the road surface, which is enough to lift the hatch cover into the air. That's exactly what happened in one of the city races. The hatch cover collided with the next car, a fire broke out, the race was stopped. Since then, to avoid accidents, the hatch covers are welded to the rim.
Natural Nuclear Reactor
One of the most serious sections of science is nuclearphysics. There are interesting facts here. Did you know that 2 billion years ago there was a real natural nuclear reactor in the Oklo area? The reaction lasted 100,000 years, until the uranium strand was depleted.
It is interesting that the reactor wasself-regulating - in the vein of uranium ores came water, which played the role of a retarder of neurons. With the active course of the chain reaction, the water boiled and the reaction weakened.
