https://youtu.be/yCBczv5FQ-0
PHYS 1101: Lecture Ten, Part One
Welcome to Lecture 10. This is the beginning material that will be covered in Exam Two for the class. And that begins with Chapter Four, which is a discussion of forces and what they’re implications are. It’s a very dense chapter, and in many ways, it’s really at the heart of the Physics 1101 class. It’s full of many counterintuitive of ideas, so I’m going to spend four lectures discussing this material, many of which are going to focus on the concepts behind this and developing your intuition for it.
Today’s lecture will be the bulk of that, covering Sections 4.1 through 4.4. Just giving you intuition for what we mean by force.
The next lecture, then, we’ll go specifically into the kinds of forces that objects typically experience in our day-to-day experiences. And then from there we will do examples, and then finally, in the fourth lecture, I will discuss Newton’s third law.
Let’s begin our lecture with our first quiz question, which is on previous material. This should ask that you understand, really in a complete picture, material we’ve covered up to now. This first question asks you about the appropriate sign for acceleration and for velocity. It’s one-dimensional motion, and you need to picture what’s being described, set up a coordinate system, and assign convention as described to answer the question.
I’ll give you six points if you answer it correctly and one point if you don’t.