Find the physical hand copied newspaper material 5, find the physical hand copied newspaper material

I rub the physical hand-copied newspaper··· Physics teacher: Let's study liberal arts...

Physics, in English, is a word in ancient Greek that refers to the natural sciences.

Beginning in the days of Galileo and Newton, it has become a fundamental science with many branches.

Physics is an experimental science, and it is also a science that advocates rationality and attaches importance to logical reasoning. Physics makes full use of mathematics as its working language, and it is one of the most sophisticated natural sciences today. In the 17th century, the Italian scientist Galileo Galilei introduced the experimental method into physics, and physics was separated from natural philosophy and became an independent discipline.

Physics is the science that studies matter and the laws of its motion; Its main research objects are matter, motion and energy. Physics is the study of phenomena such as force, heat, sound, light, electricity, and atoms. Astrophysics and modern astronomy are the application of physical theories and methods to the study of the structure and evolution of stars, the origin of the solar system, and related problems of the universe.

Because of the broad scope of astrophysics, it makes use of many principles of physics, including mechanics, electromagnetism, statistical mechanics, thermodynamics, and quantum mechanics.

In 1931, Karl discovered radio signals emitted by celestial bodies and began radio astronomy. The frontiers of astronomy have been expanded by space exploration. Interference in the Earth's atmosphere necessitates the use of infrared, ultraviolet, gamma and X-rays to observe space.

Physical cosmology is the study of the formation and evolution of the universe on a large scale.

Einstein's theory of relativity plays a central role in modern cosmology. In the early 20th century, Hubble discovered that the universe was expanding from the diagram, which promoted the discussion between the steady state theory of the universe and the big **. The discovery of the cosmic microwave background in 1964 proved that the big ** theory may be correct.

The big ** model is based on two theoretical frameworks: Einstein's general theory of relativity and the principle of cosmology. Cosmology has established the ACDM model of the evolution of the universe, which includes the expansion of the universe, dark energy, and dark matter.

From the new data from the Fermi Gamma-ray Telescope and the refinement of the existing model of the universe, many possibilities and discoveries can be expected.

Especially in the next few years, there are likely to be many discoveries surrounding dark matter. Nowadays, the relationship between physics and science and technology coexists, intersects and promotes each other. "Without yesterday's basic science, there would be no today's technological revolution."

For example, the use of nuclear energy, the generation of lasers, tomography (CT), superconducting electronics, particle scattering experiments, the discovery of X-rays, the theory of stimulated radiation, the microscopic theory of low-temperature superconductivity, and the birth of electronic computers. The creation of almost all major new (high) technology fields has been preceded by a long gestation in physics.

A hand-copied newspaper is another form of newspaper that can be circulated, viewed, and posted. In schools, hand-copied newspapers are a good form of activity in the second classroom, which is quite malleable and free. Hand-copied newspapers are also a mass propaganda tool.

1. Phenomena related to the knowledge of mechanics

1. The spout and belly of the electric kettle form a communicator, and the water surface is always flat.

2. The thin blade of the kitchen knife is to reduce the force area and increase the pressure.

3. The blade of the kitchen knife has oil, in order to make the contact surface smooth and reduce friction when cutting vegetables.

4. The handle of the kitchen knife, the handle of the spatula and the handle of the electric kettle have convex and concave patterns, which make the contact surface rough and increase the friction.

5. When the shovel feeds coal, it uses the inertia of coal to send coal into the furnace.

6. Pour boiling water into the thermos flask, according to the sound of the water level, due to the increase of the amount of water, the length of the air column decreases, the vibration frequency increases, and the tone increases.

7. When sharpening the kitchen knife, it is necessary to water it continuously, because the friction between the kitchen knife and the stone produces heat to increase the internal energy of the knife, the temperature increases, the hardness of the knife edge becomes smaller, and the knife edge is unfavorable. Watering is the use of heat transfer to reduce the energy in the kitchen knife, reduce the temperature, and not rise to too high.

2. Phenomena related to the knowledge of electricity

1. Rice burger cooking, electric wok cooking, and electric kettle boiling water are the use of electrical energy to convert into internal energy. They all use heat transfer to cook rice, cook vegetables, and boil water.

2. The exhaust fan (range hood) uses electrical energy to convert into mechanical energy, and uses air convection to transform air.

3. The three-pin plug of the rice cooker, electric wok, and electric kettle should be inserted into the three-hole socket to prevent the occurrence of electrical leakage and electric shock accidents.

4. Microwave oven heating is uniform, high thermal efficiency, hygienic and pollution-free, the heating principle is to use electrical energy to convert electromagnetic energy, and then convert electromagnetic energy into internal energy.

5. The electric lamp in the kitchen uses the thermal effect of electric current to work and convert electrical energy into internal energy and light energy.

6. The kitchen stove (honeycomb coal stove, liquefied gas stove, coal stove, wood stove) converts chemical energy into internal energy, that is, fuel combustion releases heat.