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: Work done by the hammer in a single stroke?

  1. Nov 28, 2006 #1


    User Avatar

    Need some verification.

    I am trying to drive a 9 inch nail into a log with a 10kg hammer, raising it to a maximum height of 1m and then gain momentum as it is swung down.

    a. Energy of the hammer immediately prior to striking the nail:
    [tex]10kg\times10\frac{m}{s^2}\times1m = 100J.[/tex]

    b. If 20% of hammer's energy is dissipated during the collision, how much energy is delivered to the nail in a single stroke provided the hammer remains at rest after hitting the nail?

    [tex]80\%\times100J = 80J.[/tex]

    c. Work done by the hammer in a single stroke?

    Shouldn't this be the 100J also?

    d. How far into the log is the nail driven in a single stroke?

    Not sure about this one!

    Could someone please give me some hints on these. Thanks.
  2. jcsd
  3. Nov 28, 2006 #2


    User Avatar
    Science Advisor
    Homework Helper

    Did you state all the information you were given for this problem? It seems that some assumption is being made that I am not seeing, and since nobody else has replied I assume others are not seeing it either.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook