# Introduction to physics

This introduction to physics is for anyone with a desire to learn physics.

You are a student in high school and you need  a solid introduction to help you tackle the jargon you hear from your teacher.

You are in college and you feel like you are falling behind. Get back on tract here before it is too late

You are just curious about physics. You have never learned physics before and you need some good guidelines to get started without the exorbitant cost of taking a course.

Just like mathematics, it is hard to separate physics from  the world we are living in.

A little history﻿

Everything started with the study of natural philosophy.

Natural philosophy used to be the study of unanswered questions about nature.

As more and more answers are found, natural philosophy became science. The physical sciences deal with nonliving things and branch into areas such as physics, geology, astronomy, and chemistry.

### Introduction to physics or rocket science course?

Goals

We will of course study physics here and introduce the most important topics to include

Mechanics :  linear motion, Newton's laws, circular motion, etc.

Properties of matter : liquid , solid, or gas

Electricity and magnetism : electric current, circuits, tec.

What you get on my site is an introduction. You will not be ready to put together a rocket. However, I will help you understand all the subtleties that will prepare you for more challenging courses in physics.﻿

No serious study can be done without a good understanding of mathematics.

We will not try to cloud physics with math, but math will help understand physics.

Keep in mind that the better you understand math, the more comfortable you could be with physics.

The better you understand physics, the more well rounded you could be with other branches of sciences.

### The scientific method

1. Identify a problem
2. Make an educated guess about the answer. This is called hypothesis.
3. Perform experiments to test your hypothesis
4. Formulate a general rule

When the last step in the scientific method is tested over and over again and it is still not contracted, it is then known as a law or principle.

Sometimes, scientists find new evidence that contradicts a law or principle. In this case, the previously accepted lay or principle must be rejected until another one is found.

The introduction to physics you get in this site will explain laws and principles that are accepted as of today.

Physics is a progressive science as scientists change their mind all the time, so don't be shock when a change is made.  it is a good thing when they change their minds and find a better solution to explain our physical world.

Introduction to physics blog
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Units of Speed
Learn what the units of speed are. Learn also how to convert a unit to another such as miles per hour to kilometer per hour
What is a Vector?
What is a vector? Definition, mathematical representation, and graphical representation of vectors
Trigonometric Identities
A list of the basic trigonometric identities with some good illustrations.
Definition of Speed
A definition of speed is given with crystal clear explanations and examples
Difference between Distance and Displacement
Learn quickly the difference between distance and displacement
Definition of Velocity
A definition of velocity is given with crystal clear explanations and examples. Velocity versus speed is also explained.
Definition of Acceleration
A definition of acceleration is given with crystal clear explanations and examples. The difference between speed and acceleration is also explained.
Free Fall Equations
Find here the free fall equations and an explanations of where these equations came from
Graph of Speed
Learn to read the graph of speed versus time
Definition of Inertia
A definition of inertia along with great discoveries by famous mathematicians and physicians such as Galileo and Newton
Newton's Second Law
Newton's second law of motion is explained here in plain English. Learn how to derive the formula F = m x a
Third Law of Newton
Explanations and examples of the third law of newton. Learn about action and reaction
Projectile Motion
Learn what a projectile motion is and why the path of a projectile is parabolic.
Difference between Rotation and Revolution
Learn quickly the difference between rotation and revolution
How to Calculate Momentum
This lesson will show you how to calculate the momentum of moving objects
Work Formula
Find the work formula here and learn about the meaning of work in physics
Vibrations and Waves
Understand quickly the meaning of vibrations and waves with crystal clear explanations
Reflection and Refraction
Learn the difference between reflection and refraction
What is a Neutral Atom
What is a neutral atom? Find out what an atom is with crystal clear explanations
What is Temperature?
What is temperature? Please explain to me clearly in terms that I can understand
What is Thermodynamics?
What is thermodynamics? Get the answers here and all the facts with crystal clear explanation
Great Electricity Lessons and some history.
These electricity lessons will show you in simple terms how electricity work.

## Recent lesson 1. ### Law of Reflection

Mar 16, 17 03:15 PM

Great lesson about the law of reflection. Crystal clear explanation