What is the focus of physics in the second year of junior high school and how should I learn it?

I'm from here, and the biology part accounts for less than 5% of the high school entrance examination, mainly electricity, mechanics, and a few electrical questions are quite difficult, so it's easy to learn, and listen carefully when you review in the third year of junior high school, which will help you.

The focus is on the force part and pressure and buoyancy, the difficulty is pressure and buoyancy, and this is also the focus of the high school entrance examination. The content of the last semester is not very difficult, as long as you master the basic knowledge, you can solve it, and the first half of the content of the next semester is also very easy, but the mathematical foundation of the unit of learning density must be solid. Mechanics requires a certain level of thinking ability and is related to everyday life.

Pressure and buoyancy are difficult to expand knowledge, and problems must be solved clearly. It's similar to math in general, but it's a lot of fun.

Physics in the second year of junior high school is not difficult, anyway, the most important thing is to listen carefully in class, and if you don't understand anything after class, you must ask the teacher in time, which is very important. The focus of the first semester of the second semester of junior high school should be on the imaging of plane mirrors and convex lenses, and the focus of the second semester should be on mechanics, pressure and buoyancy.

In chemistry, lay a good foundation first, and then you will naturally understand it quickly.

There are six chapters in Physics: Mechanical Motion, Acoustic Phenomena, Changes in the State of Matter, Light Phenomena, Lenses and Their Applications, and Mass and Density.

Chapter 1 Mechanical Motion: Section 1 Measurement of Length and Time; Section 2: Description of Movement; Section 3: The speed of movement; Section 4 measures the average velocity.

Chapter 2 Acoustic Phenomena: Section 1: The Generation and Propagation of Sound; Section 2: Characteristics of sound; Exploitation of the sound in verse 3 ; Section 4 Noise Hazards and Control.

Chapter 3 Changes in the State of Matter: Section 1 Temperature; Section 2: Melting and solidification; Section 3 Vaporization and Liquefaction; Section 4: Sublimation and Condensation.

Chapter 4 Light Phenomena: Section 1 Linear Propagation of Light ; Section 2 Reflection of Light ; Section 3 Plane Mirror Imaging ; Section 4: Refraction of light; Section 5: Dispersion of light.

Chapter 5 Lenses and Their Applications; Section 1 Lenses ; Section 2: The Lens of Life ; Section 3: The law of convex lens imaging; Section 4 Eyes and Glasses; Section 5: Microscopes and Telescopes.

Chapter 6 Mass and Density: Section 1 Mass ; Section 2 density ; Section 3 measures the density of a substance; Section 4: Density and Social Life.

Physics:

Physics is the study of the most general laws of motion of matter and the basic structure of matter. As a leading discipline in the natural sciences, physics studies the most basic forms and laws of motion of all matter, from the universe to elementary particles, and thus becomes the research foundation of other natural science disciplines.

Physics began in the days of Galileo and Newton, and 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.

The above content reference: Encyclopedia - Physics.

1. All objects in the universe are doing mechanical motionMechanical motion is the most prevalent form of motion in nature.

2. The key to judging whether the object is moving mechanically is to see whether the object has a "change in position".

3. Speed of sound: The distance that sound travels in per second. The speed at which sound travels depends on the type of medium and temperature.

The propagation velocity of sound in different mediums is different, and the propagation velocity of sound in the air of 15 is 340m s.

4. Echo:During the propagation of sound waves, they will be reflected when they hit large reflective surfaces (such as the walls of buildings), and the reflected sound waves that can be distinguished from the original sound are called echoes. The conditions under which the human ear can distinguish echoes are:

The time interval with the original sound is greater than.

5. Regulations on Celsius temperature:The temperature of the ice-water mixture is defined as 0 at one standard atmospheric pressure and the temperature of boiling water at 1 standard atmospheric pressure is 100, and there are 100 aliquots between 0 and 100, each representing 1 degree Celsius.

The human education version of the eight upper physics bai

Affirmatively, the first part of the multiple-choice question in front of the previous du is yes.

It is the dao of sound and light, and the latter especially the choice of the inner axis of the pressure must be electrical. It's pretty much the same if you fill in the blanks, but you should add lenses, changes in the state of matter, magnets, and the final finale is also electrical. If you want to do well in the exam, you must have knowledge of electricity.

First of all, you have to break through the circuit diagram, you must accurately understand the characteristics between the series circuit and the parallel circuit, and be able to draw the circuit diagram according to the physical diagram, because there must be, this depends on your usual accumulation. As long as you can memorize the knowledge points in the book, it is almost the same, and you should use it flexibly during the exam, not too rigid, messy set of things in the book, and pay attention to the smaller words, because it may be different. You have to listen to the teacher's lecture, the teacher will take you to review, and the teacher is more experienced, you listen to the teacher's analysis and you will know that ** is the key, which is more accurate.

Also pay attention to rest and don't drive at night.