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Homework Help: Work and mass

  1. May 7, 2016 #1
    1. The problem statement, all variables and given/known data
    Is the amount of work depending on the mass?
    2. Relevant equations

    3. The attempt at a solution
    attempt one:
    because if you have a higher mass, it takes longer to make a certain object move over a certain distance, but it doesn't matter because time isn't measured. For example move a 4kg block over 3 meters with 6 newton or move a 20 kg block over 3 meters with 6 newtons, the work remains the same (3*6=18J).
    Attempt two:
    But when the mass is increased, in the formula F=m*a, the force is increased. So the work in the situation above should be increased? thereby making the work (20/4=5) 5 times bigger. What am i doing wrong?
  2. jcsd
  3. May 7, 2016 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Good. As long as the force and the displacement are the same, the work done will be the same.

    In the above, the applied force is kept the same. So when the mass is increased, the acceleration is decreased. But so what?
  4. May 8, 2016 #3
    thank you very much
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