https://youtu.be/odWnNLduC58
PHYS 1101: Lecture Four, Part One
Welcome to Lecture 4. In this lecture we’re going to begin discussing Chapter 2. We’ve now finished our math overview from Chapter 1, and we’re ready to start some physics.
The bulk of this class is going to be studying the physics of motion, why things move, how they move. But before we do that, we have to begin with defining some specific terms. These terms are going to give us a means of very uniquely and exactly describing the motion of an object.
What we’re going to have to do is learn to slow down, critically in our mind, picture the motion of an object as we read a problem or as we watch the motion around us day to day. We need to slow down and learn how to critically look at that motion and analyze it and begin to see it in terms of these specific definitions or aspects of the motion that we’re going to need to use in order to exactly describe it. You’ll see more what I mean as we go along.
In essence, we’re going to learn that it’s important to define unique terms that are going to describe position, velocity and acceleration, or as these sections are titled, “Displacement”, “Speed and Velocity”, and “Acceleration”.
Let’s begin, as we usually do, with our warm up bonus question. Again, I’ll give everybody a +1 if only a small fraction of the class gets it right, +4 if the majority of you get it right. And it’s about vector addition and what would be the resultant or the proper signs for the scalar components of the resultant, where the resultant R is equal to the vector sum of vector A plus B?