PH2014_Ch10_11 - Chapter 10-11 Force Work Energy Work Kinetic Energy Push a crate with a constant force as indicated F vA=0 vB= A B Fdx = mvdv = B

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

View Full Document Right Arrow Icon
Chapter 10-11: Force, Work, 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
Work & Kinetic Energy Push a crate with a constant force as indicated. v A =0 v B =? F A B dK mv d mvdv Fdx = = = ) ( 2 2 1 A B B A B A K K mv d Fdx = = ) ( 2 2 1 Work= Kinetic Energy =
Background image of page 2
Work & Potential Energy F=Mg m y B =h y A =0 Work: lift a crate from the ground (y=0) to a height h. dU mgy d mgdy Fdy = = = ) ( A B y y y y U U Mgy d Fdy B A B A = = ) ( Work= Potential Energy =
Background image of page 3

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

View Full DocumentRight Arrow Icon
Definition of Work If the force and displacement are in the same direction, work is defined as: ds F dW = ds F Work B A = The work is done over a distance by force F: Displacement Force AB Area under Force = ds dW
Background image of page 4
Properties of Work (1) Work can be used to change kinetic energy: 2 2 1 2 2 1 A B A B mv mv K K Work = = (a) Push: increase kinetic energy (b) Drag: decrease kinetic energy (2) Work can be used to change potential energy: (a) Gravitational energy: Work=U B -U A =mg(y B -y A ) (b) Elastic energy: Work=U B -U A = 1/2 ·k( x B ) 2 - 1/2 ·k( x A ) 2
Background image of page 5

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

View Full DocumentRight Arrow Icon
Problem Solving 1 A 10-kg bucket of water is lifted out of a well (5m deep) by a man. The work done by the man is about: Force: F=mg=10-kg × 10m/s 2 =100N Displacement: y=5m Work: W=F ×∆ y=500N·m=500J
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/17/2008 for the course PHYS 2014 taught by Professor Nandi during the Spring '08 term at Oklahoma State.

Page1 / 16

PH2014_Ch10_11 - Chapter 10-11 Force Work Energy Work Kinetic Energy Push a crate with a constant force as indicated F vA=0 vB= A B Fdx = mvdv = B

This preview shows document pages 1 - 7. Sign up to view the full document.

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