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: Need help with conceptual questions!

  1. Nov 4, 2012 #1
    1. The problem statement, all variables and given/known data

    1) If one object is accelerating, there must be another object that is accelerating (T/F/N)
    2) A stationary object can exert a kinetic force. (T/F/N)

    2. Relevant equations
    2) F=ma

    3. The attempt at a solution
    1) My answer is false for this one because if the object doesn't interact with any other objects it won't cause any acceleration to other objects. (I learned that Δp=-Δp. If I divide both side by Δt, I will get F=-F. Assuming masses are constant, there are changes in acceleration?)
    2) My answer is also false for this one since stationary object has zero acceleration, all the forces sum up to zero also. (If you pushes an object on a floor, would the floor exert a kinetic friction on the box when it's stationary?)
  2. jcsd
  3. Nov 4, 2012 #2
    1. If an object doesn't interact, does it accelerate? Think of Newton's Third Law.
    2. What is a kinetic force? I've never heard this term before.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook