00:01
Let's review how to add vectors.
00:06
So let's say we have two vectors, vector a and vector b.
00:11
How do we add these two vectors together? we pick a starting point and we'll draw vector a starting from that point.
00:23
Then we connect this to vector b by starting at the tip of a and drawing b from there.
00:31
This is now our finishing point.
00:34
The resultant goes first.
00:38
From the starting point to the finishing point.
00:42
So this green vector is a plus b.
00:47
The only way for two vectors to sum to be zero is for the starting point and the finishing point to be at the same location.
00:57
So for example, one way we can get this to be true is to have a vector c and a vector d that has the same magnitude but is pointing in the exact opposite direction.
01:10
Now, when we sum these two vectors, we get vector c, and then we draw vector d starting from the tip of vector c...