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: Very simple question.

  1. Nov 4, 2006 #1
    We have a block on a frictionless inclined plain. Someone's hand is pushing the block up with constant velocity. So, the forces acting on the block are the normal force, gravitational force...and is that it? I mean the block is moving at constant speed upward so why should that be a force. I think Im wrong here...but why?
  2. jcsd
  3. Nov 4, 2006 #2
    Yes that's it
  4. Nov 4, 2006 #3


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    The block is moving at constant speed. That means no acceleration. No acceleration ==> no force. But as you said, there is gravity and a normal force acting on the block. So it must be that the hand pushing the block exerts a force such that it counter-balances the other 2 and makes the net force 0.
  5. Nov 4, 2006 #4
    no *net* force, of course, like you say at the end :)
  6. Nov 4, 2006 #5
    Sorry, my mistake. Of course Quasar is right
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook