
Differential Equations Ordinary and Partial Differential Equations Math Forum 
 LinkBack  Thread Tools  Display Modes 
August 30th, 2017, 12:13 PM  #1 
Newbie Joined: Jul 2017 From: Iraq Posts: 18 Thanks: 0  massspring problem 1. The problem statement: Suppose at time zero, the bob was drawn upward four units from the equilibrium position, let C=2, K=2, m=1 lbm, initial speed=2 unit/sec find an expression for body's position. and in the solution it says: y''+6y'+5y=0 my question is: where do the numbers (6) and (5) that are in the above DE come from? 2. Relevant equations spring equation: my''+cy'+ky=f(t) consider f(t) =0 3. The attempt at a solution stopped at first because of the first step Last edited by skipjack; August 30th, 2017 at 02:55 PM. 
September 3rd, 2017, 05:45 AM  #2 
Math Team Joined: Jan 2015 From: Alabama Posts: 2,826 Thanks: 753  If, as you say, my''+ ky'+ Cy= 0 and you are given that C= 2, k= 5, and m= 1 then the equation should be y''+ 5y'+ 2y= 0 with initial condition y(0)= 4, y'(0)= 2.


Tags 
massspring, problem 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
2nd Order Diffequation with spring mass dashpot system  wuzhe  Calculus  1  March 1st, 2016 03:16 AM 
Initial value & massspring equation problems please help!  heartilly89  Differential Equations  1  April 14th, 2014 10:59 PM 
Double mass spring damper  Bondgraph  philip  Physics  0  November 6th, 2013 03:51 PM 
Stability of a standart massspring system  ronaldinho55  Calculus  0  September 11th, 2013 07:39 AM 
Springmass system  matsorz  Calculus  1  September 5th, 2011 10:12 AM 