1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Is Work done when there is constant velocity?

  1. Oct 7, 2013 #1
    1. The problem statement, all variables and given/known data
    "You carry your 14.0 kg bag of textbooks horizontally 1.8 m above the ground, at constant velocity for a distance of 25 m. Ignore wind resistance. How much work do you do on the bag in the process?"

    2. Relevant equations

    3. The attempt at a solution
    If work equals force times distance, and force is equal to mass times acceleration, wouldn't the whole thing equal zero because of the constant velocity = no acceleration?
  2. jcsd
  3. Oct 7, 2013 #2

    Doc Al

    User Avatar

    Staff: Mentor

    The net force on the bag is zero. But what force do you exert and what work does that force do?
  4. Oct 7, 2013 #3
    use that along with what Doc Al suggested.
  5. Oct 7, 2013 #4
    So is there only work being done in the vertical direction, aka. the force is takes you to physically hold the bag up?
  6. Oct 7, 2013 #5
    If there's displacement in that direction, yes. Work is proportional to displacement.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted