   Basic math
  Hey,In a book I'm reading, some basic math is explained. The problem is that I'm not able to understand it because of the English terms which confuses me (English is not my first language). Could anyone explain the difference between:vectorspeedmagnitudedirectionforcestrengthvelocityI'm really confused with all these terms. What is the difference between speed, force and strength for example? I really don't understand what this could mean in game programming.Thank you   
Vector: An ordered tuple of numbers. Vectors are used to represent many of the other items on your list. In 3D they look like <x, y, z>.Speed: A scalar value describing how fast an object is going. It's equivalent to the magnitude of the object's velocity vector. So if one object is going 45 MPH North and another is going 45 MPH West, they both have the same speed of 45 MPH.Magnitude: In this context, the "size" of a vector. So a vector representing a 5N force has a greater magnitude than one representing a 3N force. In 3D, the magnitude of a vector is sqrt(x^2 + y^2 + z^2).Direction: I don't really know how to define direction, except by example. If a car is moving North, the direction of its velocity is North.Force: Something that causes acceleration. If you apply a force to an object, it will begin to accelerate in the direction of the force. Force is represented by a vector.Strength: This isn't really a technical term. It refers to how powerful something is.Velocity: The speed and direction of an object, represented by a vector. If a car is moving 45 MPH North, its velocity is 45 MPH North. Note that direction does matter for velocity, so that a car moving 45 MPH North has a different velocity than a car moving 45 MPH West.   ;Current Action"Indeed? You must still be affected by whatever put you under for so  long. Please, our house is yours while you recover," says Tarah. Still  smiling, she turns to head back out of the room. "I was just about to  put supper on the table," she calls back as she disappears, "you are  welcome to join us." Voryn lingers a moment longer, his gaze still upon  you. You can see suspicion in his eyes and your mind claws for a name to  give him, but what should be easily recalled seems lost forever.  Finally Voryn grunts and turns to exit the room.Last ActionThe man and woman look at each other, as if just realizing they haven't  introduced themselves, or silently debating whether they even should.  Then the woman turns to you and smiles, though her husband's face  remains impassive. "How rude of us. My name is Tarah," she gives you a  small curtsy you assume to be traditional and gestures back to the man.  "This is my husband and owner of this land, Voryn." The man, Voryn, nods  as he crosses his arms and leans against the jamb. "Before we are fully  introduced, "he says, "we must also know your name."[font="Courier New"]"I was orphaned young, I do not recall my name"---35----|||||||---------------------------12.5%"Oh is that so? I don't feel like telling you."---26----||||------------------------------9.28%"I am simply a Traveler"--------------------------93----|||||||||||||||||||||-------------33.2%"I'm... I'm having trouble remembering..."--------126---|||||||||||||||||||||||||||||||---45%[font="Arial"]Total Votes: 280BackstoryYou are a traveler. Orphaned at a young age, you have survived on your  own throughout your early years hopping from village to village and  learning to live off the land. You began hearing stories from other  travelers of a great civilization far off beyond the tall mountains. No  one from there was willing or able to give you details - all they could  remember was that it was grand and amazing. Curious, and with nothing to  tie you to this land, you have set out to find this place. After  crossing the mountains and a substantial desert on the other side, you  have once again reached fertile land. You made camp beneath the trees  for the first time in many weeks, but when you awoke again, you find  yourself in a house with no memory of having traveled there.Inventory[1] Strange-smelling fungusCodex- someone named "Ashwyn" appears to be a powerful... person?- you are in some region of the land know as the "hinterlands", east of a river known as the "Feora"Story LogYou wake up. The room is dark. Where are you? How did you get here? You  see light beneath a door and hear voices in the next room speaking  softly.> Sneak up to the door and listenYou get up and sneak over to the door. It is thick and wooden. Little  sound gets through, but you hear a man and woman talking about someone  named "Ashwyn". They sound fearful.> Search the roomWith your eyes now adjusted to the dark, you carefully work your way  around the room. The bed is a simple feather mattress on wood slats.  Some empty shelves are on one wall, covered in dust. A low table resides  in the corner. There are no windows. Your nose picks up a peculiar  smell that leads you towards a blank wall, but as you get closer you see  fungus growing on it. You scrape it off and put it in your pocket.> Look for a way outYou peer closely at the wall, wondering if perhaps the fungus meant  there was a seam or doorway built there. Before you can complete your  examination however you realize the conversation in the next room has  stopped and footsteps approach the door. Before you can even decide what  to do it swings open, flooding the room with light. As your eyes  readjust, the voice of a woman speaks: "Oh good, you're awake!"> "Where am I? How did I get here?""you're out in the hinterlands east of the Feora River, we run a small  farm here," says the woman. You see she is short and lean of frame, wiry  muscles beneath her shirt and slacks show she is no simple kitchen  maiden. "We discovered you unconscious in your camp - we saw your  cooking fire smoke run up for two days straight and feared the bush  afire." She steps into the room and a man follows, medium height with a  dark beard and piercing eyes. "My husband carried you back here." The  man gives you a nod but otherwise remains silent, his stare seems  off-putting.> "How long have I been asleep?"The man speaks up, his voice smooth and melodious instead of gruff and  coarse as you expected. "You've laid here in bed for five cycles of the  sun - how long you had been asleep when we first found you, we cannot  guess." He looks you up and down, though his voice is gentle his stare  continues to be intense. "Are you fit? Can you travel?"> "I am fine, but who are you two?"