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: Vectors problem

  1. Jun 8, 2009 #1
    Hi,
    I ve got two questions.

    1. how to find the component of the force F in the direction of the displacement s?

    I have two vectors and angle between them.


    2. how to find moment of force F when applied at position r= 2a+7b-3c


    No idea how to start:(. Thanks for helping me.
     
  2. jcsd
  3. Jun 8, 2009 #2

    LowlyPion

    User Avatar
    Homework Helper

    1) It very much depends on the angle doesn't it? Then which axes you choose to determine he result. I usually choose the axes that make calculation the easiest - like along one of the vectors.

    2) Moment is r X F. Your interest then will be in the cross product between the displacement and the force.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook