High school physics simple concepts, high school physics what

The resultant force is the resultant force, and it cannot be said that the package does not include gravity. If the resultant force is gravity, then this sentence also works. In the resultant force of a balanced object, the gravitational force is generally canceled out by the supporting force.

Mechanical energy is kinetic energy + potential energy, which cannot be said to be kinetic energy. The kinetic energy theorem contains that the resultant force does work on the object, and the work done affects the mechanical energy, for example, the free fall motion, at this time the resultant force is what you call gravity, and the gravity does positive work on the object, and the kinetic energy of the object increases, that is, the velocity of the object increases when it falls, and the mechanical energy remains unchanged (only the mechanical energy of the object is conserved when the gravitational force does the work), because the kinetic energy increases while the gravitational potential energy decreases accordingly. Therefore, it is necessary to make a correct distinction between the conservation of mechanical energy and the theorem of kinetic energy.

If you don't understand something, you continue to ask me, and I'm tired ......Hope it works for you.

I remembered a phrase from my physics teacher.

The work done by the external force is equal to the increase in kinetic energy, and the external force does not include the gravitational force and the elastic force.

The work done by the combined external force is equal to the amount of change in mechanical energy, which includes gravity and elastic force.

Mechanical energy = kinetic energy + potential energy) (I think it can also be understood as the change of potential energy corresponding to the work done by gravity and elastic force, then you can determine whether the potential energy changes to include gravity and elastic force in the resultant force).

Okay, that's all.

Gravity is included in the resultant force.

Mechanical energy is the sum of the kinetic energy and potential energy of an object.

The resultant force in kinetic energy may also have external forces such as friction.

What about high school physics? What are some good ways to study?

Now there are many friends, all say that for high school physics is a relatively difficult subject, which makes physics a kind of sore in the hearts of many high school students, in fact, learning high school physics is also very simple, as long as you master good ideas, cultivate your own study habits, let yourself like this subject, in fact, it is relatively simple.

High School Physics Textbook.

1. Learn more, observe more, and think more.

In fact, high school physics is about some theorems of things in nature, these are many things around us that contain these truths, there is physics everywhere in life, for example, every time we take a car, we can see the outside world and the things outside these cars are going backwards, this is the reference in our high school physics, this knowledge point, there is knowledge everywhere in life, you have to experience it with your heart.

As long as we have an eye for discovery, you must look more at the many phenomena in your life, whether it is natural or life, you also have to look at the stars at night, see their changes, you will also find light and heat in physics and some law problems. This knowledge is still present in our lives.

1. Learn to start with theorems.

You have to attach great importance to some theorems and some dead concepts and some laws, but you not only have to remember this knowledge from time to time, you have to learn how to use it, this is the key, smart children are using these formulas and then applying them to their own mistakes, from which to find the problem, you also have to do from a small mistake, you can review a lot of knowledge, it is really a double harvest, which is also the key to whether students can open up in high school physics.

Second, change the incomprehension to be very proficient.

Because there are many new concepts in high school physics, and there are also some nouns such as: potential energy, elastic potential energy, etc., you don't see these words that you haven't seen, and you don't like them, you know? As long as you have a deep understanding and look carefully, and then you look at some textbooks and some tutorial books, you can understand.

For learning, if you like this subject more, the better you will learn, maybe for various reasons to make you like this subject, maybe because of the teacher, some teachers grasp it tightly, you learn this subject very well, but some students just like this teacher and like this subject, if you change the teacher, you will not learn well, in fact, this is harmful to yourself.

High School Physics Exam Papers.

Read every textbook, read every unit, learn every problem, have key insights and solutions for every exercise in high school physics, maybe they use the same knowledge, as long as you remember a theorem you can do many similar problems.

Newton's Laws of Motion (Three), Laws of Mechanics, Theorem of Kinetic Energy, Conservation of Mechanical Energy, Free Fall, Flat Throwing Motion, Vertical Up-Throwing, Vertical Down-Throwing, Circular Motion, Electric Field, Ampere Force, Capacitance, Magnetic Field, Lorentz Force, Motion of Charged Particles in a Composite Field, Ohm's Law of Closed Circuits, Dynamic Circuit Analysis, Faraday's Law of Electromagnetic Induction, Alternating Current, Transformer, Self-Inductive Phenomena, Inductive Reactance and Capacitive Reactance, Conservation of Momentum and Momentum, Astrophysics (Law of Gravitation), Experimental Law of Ideal Gases, Thermodynamics, Atomic physics (decay, fission, fusion, etc.) and many more.

It is very similar to the knowledge structure of junior high school physics, it is still mechanics, electromagnetism, heat, mechanical vibration, optics and a part of atomic physics, this part of atomic physics may not be learned in junior high school, but high school does not have high requirements for this part of knowledge, you only need to know what it is, you don't need to know why. In high school, there are more examines of mechanics and electromagnetism, of course, the difficulty is higher than that of junior high school, so you need to study hard ( ) Come on!

Mainline mechanics and kinematics. Magnetic fields, electricity, etc., will be interspersed with the mid-term.

Mechanics and acceleration are key, and the range of questions is very flexible.

Learn to think, not rote. Otherwise, it will be very painful to learn, and it will not be good to learn.

The concept of high school physics is:...The law of change in nature that can be understood by a high school student is a subject, and this subject is called high school physics.

Force: Force is the pressure, friction and so on between objects due to a certain relationship.

Acceleration: Due to the external force received by the object, the object cannot maintain a static or uniform linear motion due to the hailstorm, and the resulting velocity change is called acceleration wide.

Conservation of mechanical energy: In the state where the object is only subjected to gravity, the kinetic energy and gravitational potential energy remain conserved, which is referred to as the conservation of mechanical energy.

Work: The change of kinetic energy, gravitational potential energy, heat energy and other energy such as kinetic energy and gravitational potential energy and heat energy is called the work done by the force on the object.

Energy: The kinetic energy, gravitational potential energy, thermal energy and other unbridled energy existing in the object itself are collectively referred to as energy.

It's the same as I used to be, and that actually has a method, and what the teacher told me is very different, first of all, it's rote memorization, memorization of concepts, ideas, and then it's about doing the problems in the book, and doing the problems is not just a simple mechanical problem, but it is necessary to summarize the solution methods that don't have questions, and the teacher used to ask us to write out the methods and do them again, maybe a little annoying, but it works.

When you see a question and the method of solving it can be presented to your mind, you will be able to basically cope with the information book.

The knowledge of books is relatively simple, and the examination paper is to synthesize all kinds of knowledge on the premise of book knowledge, and sometimes there is reverse thinking and so on.

Therefore, it is necessary to have a thorough understanding of the knowledge of the textbook. Connect various types of knowledge and use formulas flexibly. Rather than knowing a little textbook knowledge, you can do it.

If you want to improve your score, you must understand the various solutions of various types of questions, and then analyze and summarize them, so as to ensure that you will not let go of this type of question again, so that you can be handy in the exam.

You can do more questions, I'm from Qidong. There are a lot of people studying physics here, if we have a few weak subjects, we will drill those few subjects, I have a stack of physics reference books in my third year of high school (almost all of them) There are many books, you will find that some of the topics are the same, and you will have less fear of the topic if you do more, which is very important, you must first have the confidence to do the problem before you will solve the problem seriously. Summarize the rules of the same problem, the wrong problem set can be used to write the medium problem again, it is useless to drill the difficult problems in physics, and it is good to do the difficult problems assigned by the teacher.

The three elements of mechanics, such as electricity, light, and sound, are all focused.