Unit 5 - Part 1

Unit 5: 

Vector: A quantity that has both magnitude and direction.

So far in unit 5 we've only covered Vector Analysis and Newtons 1st law, the law of inertia. But before talking about Newton lets go over what Vector Analysis is. Vector analysis is being able to identify the Vector in a word problem and then based on that solve. There are different ways to solve Vectors, the easier way for me is the "Graphical Method". When adding two vectors using the Graphing Method you simply move vector B onto the tip of Vector A. Make sure that vector B's tail is on the tip of vector A's. This is if you have two positive vectors. If you have a negative and a positive vector you will take the TIP OF B and connect it to the TIP of A. Basically you just flip vector B around. 

Just a tip, a common vector is velocity.

Drawing of Graphical Method 

Problem: Suppose that there is a train moving south at a constant velocity and that velocity is represented by vector A. Now lets say that there is a strong north flying swarm/flock of seagulls that suicide it into the train to slow it down. The seagulls will be vector B.

Two positive vectors:

Vector A = +3.0u

---------->

Vector B = -2.0u

<-----

3.0u-2.0u

the answer (C) would be 1.0u

Diagram 

---------->

                  =        ---->

    <------

For Newtons Laws we have only learned the first one and that is the law of inertia, the law of inertia states.

"Objects in motion will tend to stay in motion, unless acted upon by an outside unbalanced force." This just means that you need a force that is unbalanced to move an object at rest. Simple :)