Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Help on finding kinetic energy

  1. Oct 13, 2004 #1
    Estimate the kinetic energy acquired by a 12g nail when it is struck by a 550g hammer moving with a speed of 4.5 m/s?

    How do u find the kinetic energy? i first mutiply 550 x 4.5= 2475 /12= 206.25 am i doing it right?
     
  2. jcsd
  3. Oct 13, 2004 #2

    Tide

    User Avatar
    Science Advisor
    Homework Helper

    Kinetic energy is

    [tex]\frac {1}{2} m v^2[/tex]

    For your problem, you have to determine how much kinetic energy the hammer transfers to the nail.
     
  4. Oct 13, 2004 #3
    1/2 550 x 4.5 = so then it will be 1237.5J right?
     
  5. Oct 13, 2004 #4

    brewnog

    User Avatar
    Science Advisor
    Gold Member

    Work on those units chuck...
     
  6. Oct 13, 2004 #5

    Fredrik

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    I think this is a very strange question. You can calculate the hammer's energy, but you can't know how much of it is transfered to the nail. Is somebody holding the hammer? Is somebody throwing it? Will it bounce?

    What you've calculated is the hammer's energy, but if you want the answer in Joules you should use kilograms, not grams, as your unit for mass.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Help on finding kinetic energy
  1. Kinetic energy (Replies: 4)

Loading...