Entering

Chapter 1: Mechanics
1 Physics is all about mass (Definition of mass)
2 Curved but actually straight (uniform linear motion)
3 Weapons and mechanics are inseparable (parabolic motion)
4 How can an airplane fly? (Lift)
5. Why a collision between a truck and a car causes so much damage (Law of Conservation of Momentum)
6 Why do meteorites explode? (Law of Conservation of Energy)
7 The Principle of Friction: More Difficult Than You Think (Static Friction and Kinetic Friction)
8 Between mechanics and electromagnetism (gravity and electric force)

Chapter 2 Electromagnetism
1. I got the direction of the current mixed up! (charge and current)
Electric force between two point charges (Coulomb's law)
3 Mystery in the CRT (Electric Field)
4 Edison and the Incandescent Light Bulb (Current, Voltage, Power)
5 How do capacitors work? (Capacitance)
6 Electromagnetic forces we don't know much about (Lorentz forces)
7 Tesla and Edison's Current Wars (Direct Current and Alternating Current)
8 Between electromagnetism and thermodynamics (electromagnetic waves)

Chapter 3 Thermodynamics
1 Why do clouds form? (The thermodynamic perspective on cloud formation)
2 Why are deep-sea fish able to survive deep water pressure? (Pressure)
3 Why Ancient Scientists Believed in the First Law of Thermodynamics
4 Maxwell's Demon Does Not Exist (Second Law of Thermodynamics)
5 Can't beat the motor yet! (Heat engine)
6 How does an air conditioner blow out cold air? (Cooler)
7th column was a wave (heat conduction)

Chapter 4 Waves
1 Why can't people see sound? (The rectilinearity of light)
2 The Unexpected Connection Between Space and Baseball (The Doppler Effect)
3 The Mystery of Refraction (Wave Refraction) Learned through Algorithmic Gymnastics
4 From Newton's Rings to Quantum Mechanics (Particle Theory and Wave Theory)

Chapter 5 Atoms and Molecules
1 The truly absurd uncertainty principle (Planck's constant)
2 All matter in this world is a wave! (de Broglie waves)

Rediscover the everyday with useful physics!
A light and enjoyable introduction to physics for busy modern people.
Why can light bend despite the absence of gravity? Why did ancient scientists misunderstand the direction of electric current? "Useful Physics" provides easy and entertaining answers to the physics questions we often face at some point in our lives.
From airplanes that fly with the lift generated by their wings, to the reason why cars cannot suddenly stop while driving, to the principles of alternating magnetic fields hidden in induction cooktops, it vividly shows the laws and principles of physics hidden in the phenomena we encounter every day.
Reading this book, you will be able to clearly understand difficult physical phenomena as each physical concept and law fits together like an intricate puzzle piece.
This book also provides intellectual pleasure by correcting knowledge that we have been mistaken about.
To achieve this, we minimized complex formulas and difficult terms, and significantly lowered the barrier to entry with intuitive explanations and colorful illustrations.
From teenagers new to physics to adults seeking to refresh their knowledge from school, a fascinating physics journey for everyone begins now!

From uniform rectilinear motion to Planck's constant
Key concepts from high school physics textbooks in one volume!
This book divides high school physics into five major parts and skillfully explains them with interesting anecdotes.
Chapter 1, 'Mechanics', begins with the reason why physics uses the concept of mass instead of weight, and explains uniform rectilinear motion, parabolic motion, and the law of conservation of momentum.
The phenomenon of mirages is examined from a physical perspective based on the principle that light also bends when space is curved, and the law of conservation of energy explains how a giant meteorite that fell on the Yucatan Peninsula about 66 million years ago caused the extinction of dinosaurs.
In particular, it sheds light on the reason why friction, which is not fully understood even in modern physics, frequently appears in physics textbooks from various perspectives.

Chapter 2, 'Electromagnetism', explores the order of electricity and magnetism, including charge and current, electric fields, Coulomb's law, and electromagnetic waves.
Electromagnetism is known as a difficult field of physics to approach because we cannot see, hear, or feel it directly.
This chapter introduces Coulomb's law with an interesting anecdote to stimulate the reader's curiosity.
It also provides a wealth of knowledge about direct current, alternating current, and electricity, beyond the competition between the two scientists through the 'war of currents' between Edison and Tesla.
Chapter 3, 'Thermodynamics', deals with the concept of 'heat', which, unlike electromagnetism, can be felt but is difficult to understand because it has no physical form.
First, we look at the conditions for cloud formation and the pressure principle of gases from a thermodynamic perspective.
Next, the second law of thermodynamics is explained in detail, explaining why heat cannot flow from low to high temperatures and why this law is a core principle related to fundamental problems in physics.
Chapter 4, “Waves,” opens with the curiosity, “Why can’t people see sound?”
This chapter explains the directivity of light and the effect of the difference in wavelength between sound and light on diffraction.
Additionally, the Doppler effect, which Hubble used to discover the expansion of the universe, is introduced in a familiar way by introducing various examples of its use in everyday life.
The final five chapters, “Atoms and Molecules,” lower the threshold for quantum mechanics by focusing on key concepts.
He introduces the uncertainty principle and tells the unique story of the discovery of Planck's constant. He also introduces de Broglie waves, which suggest that even a baseball flying at a certain speed has wave properties, and kindly explains why this concept is difficult to understand.
As you turn the pages, complex physics concepts become more approachable.

Those who have given up on physics and those who want to learn it again
Let go of your fears and enjoy physics step by step!
This book doesn't simply have you memorize boring, rigid laws of physics.
Like reading an exciting mystery novel, it provides a sense of intellectual accomplishment by doggedly pursuing the fundamental question, “Why do such physical phenomena occur?” until the very end.
Just as mastering a recipe makes complex cooking easier, understanding the fundamental principles and laws of physics completely changes the way you read and interpret the world.
It is especially great for those who have given up on learning physics because it seemed too difficult or who want to learn it in a fun way.
The moment you read this book, everyday life, which you took for granted, becomes clearer through the lens of physics.
Mirages that look like puddles from afar after a rain, vending machines that give exact change and microwaves that heat up your food, cumulonimbus clouds that appear more frequently in summer due to the humid atmosphere and intense sunlight, air conditioners that regulate indoor temperatures by exchanging heat with refrigerants, even the radio waves from your smartphone that diffract and transmit through buildings due to their long wavelengths – everything in your daily life will be seen with a fresh perspective.
Let's embark on a journey into the world of physics, filled with deep understanding and the joy of discovery, with "Useful Physics."