https://youtu.be/qn8fRRuhUas
PHYS 1101: Lecture Eleven, Part One
Welcome to Lecture 11. This is our second lecture on Newton’s laws. I’m going to be covering three main topics in this lecture.
The first is discussing the types of forces that we’re going to commonly encounter and consider in this class. These are the typical forces that day-to-day objects are exposed to.
Next, I want to give you my version of the problem-solving steps that’ll help you work through real number problems involving Newton’s second law.
And then last, I’ll show you an application of those problem-solving steps as I walk through an example.
As usual, I’m going to start the lecture with a quiz question, which has been the trend, is building on past knowledge and really going over things we’ve covered in the past.
This has to do with a motion diagram, or picturing what the motion is, given a description. But in this scenario, the description of the motion that I give you, that you need to diagnose, is a plot of the velocity of this object as time goes on.
So the trace, the picture you see below, shows you the terrain, or at least part of the terrain, that you can see. At this point, the ball goes behind this curtain, and you don’t know what the terrain here is. The ball is going to roll along at a constant positive velocity, constant value. Once it gets behind the curtain, it looks like it continues with that positive value for a while, but then it undergoes this kind of change in the velocity.
What terrain do I need behind this curtain to explain this behavior, this velocity characteristic that I see behind the curtain? So, you’re going to have a text box in your web assign . . .