Understanding Physics
by Ron Kurtus (updated 17 March 2023)
Physics is a branch of Physical Science that is concerned with the study of the properties of matter, its motion, and the concepts of energy and force. The subject can be divided into three main areas: Classical Physics, Relativity, and Quantum Mechanics. The material here will concentrate on classical or everyday physics.
The knowledge of Physics is important for the development of the products we use. It is also an interesting and exciting subject of value in many walks of life. There is a great need for people who understand scientific principles and know how to think logically. Your knowledge and skills in these areas can help you excel in school, advance your career or improve your business.
The purpose of these free online lessons is to give you a start at improving your scientific knowledge of physics that will help you become a champion in the field.
Physics Contents
Basics of Physics
Using Mathematics in Physical Science
Fundamental Units of Measurement
Matter
Particles of Matter
Density
States of Matter
Temperature Constant During Phase Change
Evaporation is Changing Liquid to Gas
Fluids
Motion
Periodic Motion
Pendulum Exhibits Periodic Motion
Wave Motion
Units of Frequencies and Wavelengths
Conventions for Doppler Effect Equations
Summary of Doppler Effect Equations
Derivation of Doppler Effect Wavelength Equations
Sound Waves - Acoustics
Frequencies and Wavelengths of Sound
Doppler Effect Equations for Sound
Making Sounds with Musical Instruments
Sound Created from a String or Wire
Equation for Sound Created from a String
Equation for Sound Created from a Wire
How Obstacles Affect Sound Waves
Sound Seems Amplified Over Water
Hearing - Using your Senses
Visible Light Waves - Optics
Doppler Effect Equations for Light
Snell's Law for the Refraction of Light
Laser Battle Game (Java applet)
Electromagnetic Waves
Electricity and Magnetism
Main Electricity and Magnetism menu page. Areas of interest are:
Direct Current (DC) Electricity
Energy
Thermal Energy
Temperature
Temperature is Average Thermal Energy
Temperature Measurement: Thermometers
Heating
Thermal insulation
Thermodynamics
Nuclear Energy
Force
Work and Force
Gravity and Gravitation
See the main Gravity and Gravitation menu pages.
Major topics are:
Friction Force
Basics
Coefficient of friction
Sliding friction
Rolling friction
Role of Friction in Starting Rolling Motion