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!

Which to use->Dot or cross product

  1. May 28, 2005 #1
    a crate is sliding (disregard friction) with d=(-3.0 m)i while a steady wind pushes against the crate F=(2.0 N)i + (-6.0 N)j

    How much work is done by the wind on the crate?

    Ok W=Fd so I want to multiply the two vectors together.

    [(-3.0 N)i ]*[(2.0 N)i + (-6.0 N)j ]

    Do I use a cross product or a dot product? Why?
  2. jcsd
  3. May 28, 2005 #2
    The answer is in the proper defining equation of work.
  4. May 28, 2005 #3

    Working on homework on the weekends again...


Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Which to use->Dot or cross product
  1. Dot and cross product (Replies: 2)