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: Finding Mechanical Energy, Velocity, and Height

  1. Mar 20, 2012 #1
    URGENT: Finding Mechanical Energy, Velocity, and Height

    1. The problem statement, all variables and given/known data
    http://www.mrfizix.com/home/energy_files/image051.gif


    2. Relevant equations
    E0=EF
    PE=mgh
    KE=(1/2)mv2

    3. The attempt at a solution
    I understand how to get the potential and kinetic energy values but I'm confused as to how to get the mechanical energy, velocity, and height values. Any help would be appreciated!
     
  2. jcsd
  3. Mar 20, 2012 #2
    Re: URGENT: Finding Mechanical Energy, Velocity, and Height

    Well Mechanical Energy is the sum of the pot. energy and kinetic energy at a certain point.
    And to find the velocity you do the change in kinetic energy between two points equals the work, or you do it a more simpler way which is the Mechanical energy at one point equals the mechanical energy at another point.
     
  4. Mar 20, 2012 #3
    Re: URGENT: Finding Mechanical Energy, Velocity, and Height

    For example at point 1 PE=0 and KE=.5*60*8^2=1920 J. And the ME=PE+KE=1920J
     
  5. Mar 20, 2012 #4
    Re: URGENT: Finding Mechanical Energy, Velocity, and Height

    That makes a lot of sense! Thanks so much! :)
     
  6. Mar 20, 2012 #5
    Re: URGENT: Finding Mechanical Energy, Velocity, and Height

    Ok so just do the same for point 2. You will be able to calculate the potential energy first. Then use PE(1)+KE(1)=PE(2)+KE(2) to find the KE and then use ΔKE=W from 1 to 2 and so on untill you finish. It's pretty easy.
     
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