# Lecture22 - Energy Examples Serway and Jewett 8.1 8.3 Physics 1D03 Lecture 22 Conservative Forces path 1 A force is called conservative if the work

This preview shows pages 1–5. Sign up to view the full content.

Physics 1D03 - Lecture 22 Energy Examples Serway and Jewett 8.1 – 8.3

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

View Full Document
Physics 1D03 - Lecture 22 Conservative Forces A force is called “conservative” if the work done (in going from some point A to B) is the same for all paths from A to B. An equivalent definition: For a conservative force, the work done on any closed path is zero. Later you’ll see this written as: Total work is zero. path 1 path 2 A B W 1 = W 2
Physics 1D03 - Lecture 22 If only conservative forces do work, potential energy is converted into kinetic energy or vice versa, leaving the total constant. Define the mechanical energy E as the sum of kinetic and potential energy: E K + U = K + U g + U s + ... Conservative forces only: W = -∆ U Work-energy theorem: W = K So: K +∆ U = 0 Conservation of mechanical energy

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

View Full Document
Physics 1D03 - Lecture 22 Concept Quiz You drop two rocks from top of a building. One has mass m and the other mass 2m . When they hit the ground A) they have the same speed and same kinetic energy
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 11/08/2010 for the course PHYSICS PHYSICS 1D taught by Professor Mckay during the Spring '09 term at McMaster University.

### Page1 / 12

Lecture22 - Energy Examples Serway and Jewett 8.1 8.3 Physics 1D03 Lecture 22 Conservative Forces path 1 A force is called conservative if the work

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online