Chapter 7 Notes

Chapter 7 Notes - -The kinetic energy represents the...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 7: Work and Energy Work - Force times distance - Work done is the force exerted over a distance - W = F * dx - W = F * s * cos theta - W = F * s (dot product) Work For a Variable Force - Many forces are not constant - Therefore W = Integral from a to b, of F(x) dx - W = Integral of F (with dot product’ed) with ds o Determine the total work done by a variable force as it acts over some distance  in one dimension Kinetic Energy   - ½ mv 2  is the amount of work stored in the particle (or kinetic energy of the particle) - K = ½ mv 2   - K – K 1  = W - Delta K = W (Work-Energy Theorem) - When the particle does work, its kinetic energy decreases. The total amount of work the  particle can deliver to the obstacle is equal to its kinetic energy. 
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: -The kinetic energy represents the capacity of a particle to do work by virtue of its speed-Look at Examples Gravitational Potential Energy-Gravitational potential energy represents the capacity of the particle to do work by virtue of its height above the surface of the Earth. -When we lift a particle to some height above the surface, we have to do work against gravity, and we thereby store work in the particle -W = mgh-K 2 + U 2 = K 1 + U 1 -Problem Solving Techniques for Energy Conservation in Analysis of Motion o Write an expression for the energy at one point of motion o Then write an expression for the energy at another point o Equate the two expressions....
View Full Document

This note was uploaded on 04/11/2008 for the course PHYS 142 taught by Professor Kolomeisky during the Spring '08 term at UVA.

Page1 / 2

Chapter 7 Notes - -The kinetic energy represents the...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online