Highschool Physics pt. 1: Foundational Physics

 The main "Foundational thinkers" of physics are Isaac Newton, Max Planck, and Albert Einstein. 

When you start learning Physics, you are studying how Newton understood it, he developed the law of gravity, Newton's law.

Down the line, we will learn about tiny things, and Max Planck will teach about Quantum Mechanics. Albert Einstein will teach about the speed of light, and that nothing can travel faster than it.

And we start realizing that the universe is bigger than we could ever imagine. 

Physics can be intimidating, as math is necessary, as Algrabra, Trigonometry, and Pythagorean theorem, are necessary. But is not 100% required, as you can still do physics calculations, but it might be strange or confusing without the basic principles.

Now let's talk about Vectors and Scalars, a vector is something that has a magnitude or a size and has a direction. While a scalar only has a magnitude or size.  
I will explain, that let's take a brick on the ground and move it 5 meters to the right, this is a scalar because you only know the size of the movement. 
But if you were to use a vector, you would say the 5 meters, and you would say to the right, as you gave it a distance or "displacement".
To recap, distance is a scalar quantity, while displacement is a vector quantity. 

Vectors can also be used to explain the speed or velocity of an object. Let's say you time the brick travelling 5 meters. And lets say you took 2 second to move the brick 5 meters. to calculate the speed you are traveling. You do the 5 meters divided by time. so 5/2, 5 for the distance, and 2 for speed. and after you do 5/2, you get 2.5 m/s or 2.5 meters per second. I don't see a direction here, but it shows no direction so it is a scalar quantity.

So if you are talking about change in position and specify the change in position with a direction that's displacement, if you don't specify the direction that's distance, and if you specify the direction and speed that velocity, and if you don't give a direction you are talking about speed.