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

I have a stupid professor and need clarification on newtons 2nd law

  1. Oct 26, 2009 #1
    So is it true that if you have a constant velocity therefore you have no change in acceleration so A=0 and if you have no acceleration then you have no Fnet? And is that the case in ANY force problem?
    Thanks!
     
  2. jcsd
  3. Oct 26, 2009 #2
    More or less. A net force results in an acceleration, and no net force is 0 acceleration, which includes constant velocity situations. Technically, you could exert a force that accelerates an object to a certain velocity and then stop exerting the force; you now have an object at constant velocity with no net force (or a net force of 0N) acting on it.
     
  4. Oct 26, 2009 #3
    AKA that's the whole idea of Newton's first law or the idea of inertia. Like if you toss a ball in the air, your hand no longer exerts a force on the ball but gravity acts on it therefore it has to come back down otherwise it would keep going.
     
  5. Oct 26, 2009 #4
    I fail to see how this makes your professor stupid.
     
  6. Oct 26, 2009 #5
    ...because he didn't actually teach me any of this and I had to learn basic concepts, like this, all on my own because he can't keep on the same train of thought for more than 1 minute so he never fully develops the full idea we are supposed to be learning.
     
  7. Oct 26, 2009 #6

    arildno

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    Dearly Missed

    Sounds more like he is succinct in his explanations. Follow EACH word he says very carefully..:smile:
     
  8. Oct 26, 2009 #7

    symbolipoint

    User Avatar
    Homework Helper
    Education Advisor
    Gold Member

    Hard to know, since we do not attend your class. Does he state a definition, explain a concept, give maybe 2 examples? Review the examples in class? Is your textbook smart and sensible (like the kind as Sears, Zemansky, & Young)? How has the drop rate been in your class, and how does this compare to classes of the same course taught by other professors?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: I have a stupid professor and need clarification on newtons 2nd law
  1. Newton's 2nd Law (Replies: 10)

Loading...