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Atwood machine - find kinetic energy

  1. Nov 14, 2007 #1
    1) Massess of 1.00kg and 1.01kg are suspended in a frictionless Atwood machine
    a) Find acceleration of the 1.010kg mass
    b) Find the total kinetic energy of the masses 2.50s after being released

    So for a I set up an equation where a= (1.01-1.00)
    1.00+1.010 times 9/87m/s
    and got .0491 for accelaration is this right.


    b) im confuse
    Can anyone help
     
  2. jcsd
  3. Nov 15, 2007 #2

    rl.bhat

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    Find the velocity of each mass using vf = vi + at. Then find KE.
     
  4. Nov 15, 2007 #3
    so vf will equal
    vf= (0.0491)*(3.8s)

    Is part a right.
     
  5. Nov 15, 2007 #4

    andrevdh

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    part a is correct
     
  6. Nov 15, 2007 #5

    andrevdh

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    why do you take 3.8 seconds and not 2.50 seconds in the final speed calculation?
     
  7. Nov 15, 2007 #6
    SO KE= 1/2 mv
    so i would plugged in 1/2 times the total mass? * vf

    IS this right, I will calculate the numbers later
     
  8. Nov 15, 2007 #7

    andrevdh

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    Yes, but you need to square the speed.
     
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