What is the net work done if an object is ?

  • #1

Homework Statement


What is the net work done if an object is raised 5m, carried horizontally 8m, lowered 2m, and then lowered 3m if there is no friction?


Homework Equations



W=F x d (force times distance)
work done overcoming gravity: W=mgh (mass times gravity times height)

The Attempt at a Solution


no idea! since we don't have the mass
 

Answers and Replies

  • #2
Delphi51
Homework Helper
3,407
11
Those questions usually mean "work accomplished" rather than work "done". Your muscles would have to do some work to carry the mass, but that doesn't accomplish any change in the potential energy of the mass. In this case, the mass ends up at the same height as it started so no work is accomplished or stored in some useful form of energy.
 
  • #3
246
1
net work done ON the object, not by your muscles.
 

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