{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture09_Pushkar

Lecture09_Pushkar - PHYSICS 220 Lecture 9 Work and Kinetic...

Info icon This preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 9 Purdue University, Physics 220 1 Lecture 9 Work and Kinetic Energy PHYSICS 220
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Lecture 9 Purdue University, Physics 220 2 Energy Energy is “conserved” meaning it can not be created nor destroyed Can change form Can be transferred Total Energy of an isolated system does not change with time Types Kinetic Energy Potential Energy Rest Energy (E=mc 2 ) Thermal Energy … … Units: Joule (J) = N m = kg m 2 / s 2
Image of page 2
There is a fact, or if you wish, a law, governing natural phenomena that are known to date. There is no known exception to this law; it is exact, so far we know. The law is called conservation of energy; it states that there is a certain quantity, which we call energy, that does not change in manifold changes which nature undergoes. That is a most abstract idea, because it is a mathematical principle; it says that there is a numerical quantity, which does not change when something happens. It is not a description of a mechanism, or anything concrete; it is just a strange fact that we can calculate some number, and when we finish watching nature go through her tricks and calculate the number again, it is the same. Richard Feynman Lecture 9 Purdue University, Physics 220 3
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Lecture 9 Purdue University, Physics 220 4 Newton’s Second Law leads to definitions of work and energy The connection between force and energy is work
Image of page 4
Lecture 9 Purdue University, Physics 220 5 Work and Energy Work: Transfer of Energy by Force W = | F | | r | cos θ W depends on the direction of the force relative to the displacement
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Lecture 9 Purdue University, Physics 220 6 Work by Constant Force
Image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern