1. Not finding help here? Sign up for a free 30min 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!

Law of conservation of energy

  1. Apr 17, 2008 #1

    ka7

    User Avatar

    1. The problem statement, all variables and given/known data

    A gardener exerts a force of 1.5 x 10^2 N (22 degress below the horizontal) in pushing a large 18 kg box of flower seeds a distance of 1.6 m. The coefficient of kinetic friction between the box and the floor is 0.55.
    use the law of conservation of energy to determine the final speed of the box if it starts from rest.

    2. Relevant equations

    Total energy= kinetic energy + potential energy

    3. The attempt at a solution

    But theres no potential energy...:confused:
     
  2. jcsd
  3. Apr 17, 2008 #2

    nicksauce

    User Avatar
    Science Advisor
    Homework Helper

    You should think about how much is work is done on the box and how much is done against the box.
     
  4. Apr 17, 2008 #3

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    You should also compute the normal force the box exerts on the floor given it's being pushed from below. Use a force diagram. Don't worry about the lack of potential energy, there isn't any. Just get started.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Law of conservation of energy
  1. Conservation Laws (Replies: 2)

  2. Conservation of Energy (Replies: 0)

Loading...