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# Lect08 - Physics 211 Lecture 8 Today's Concepts Potential...

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Physics 211 Lecture 8, Slide 1 Physics 211 Lecture 8 Today's Concepts: Potential Energy Mechanical Energy Everything. In complete honesty I had a horrible day today, and to top it all off when I got my laptop out to do the prelecture and preflight it fell on my toe which is now swollen and bruised. The last thing I want to do is try to understand physics. If I was in a better mood I'd turn it into a physics problem about force, but that's just not going to happen tonight.

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Physics 211 Lecture 8, Slide 2 i think all of it is a lil blurry right now. wont clear up till lecture i hope! Stuff you asked about: Pretty much everything in this prelecture blew me away so can't wait to be blow away tomorrow in class too. How were these equations derived? I don't want to have to memorize, I would like a logical explanation of these equations. Question 1. Why shooting the ball horizontally gives the same speed as shooting up or down. Why is the potential energy of a spring hanging vertically (1/2)ky^2? I thought potential energy was always defined as mgh. How do you do a problem like #5? What is the easiest way to understand these rates/ratios? None, I just need to rewatch the video again. let's discuss polar bears eating green beans The whole thing with setting a point on a spring equal to h=0 Nothing really. Physics has been temporarily put on the back burner this week because I've had to memorize 20 amino acids, 5 nucleotides, and a whole bunch of other stuff for my biology class. However, I'll be back in physics mode on Thursday.
Physics 211 Lecture 8, Slide 3 NC E W Work done by any force other than gravity and springs will change E total K W Work Kinetic Energy theorem Summary Lecture 7 E K U Total Mechanical Energy E = Kinetic + Potential U W   For springs & gravity (conservative forces) Lecture 8

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