00:01
Okay, we should draw a free body diagram of an air freshener hanging from our rear view mirror as a car stops.
00:11
So let's imagine our car is moving, should we say to the right? let's say to the right.
00:18
So moving to the right and it slows down and stops, right? so as it's slowing down, your air freshener, a little tree one, is going to move to the right, as viewed from inside the car, right? so what angle does this refrescenter make? well, it's important to realize what direction the acceleration is in, right? so the car and the inside of the car are accelerating to the left because the velocity is to the right, but it's slowing down, so the acceleration is to the left.
01:09
So let's call left positive y.
01:15
So, or positive, positive y.
01:17
Positive x.
01:18
There we go.
01:19
So we'll go x and y.
01:23
So let's do our free body diagram here.
01:27
Here's our tree.
01:32
What forces do we have acting on it? gravity and tension.
01:41
Tension is at this angle, right? angle theta...