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: Newton's Laws

  1. Sep 25, 2010 #1
    1. A force acts on a 2 kg mass and gives it an acceleration of 3 m/s^2. What acceleration is produced by the same force when acting on a mass of (a) 1 kg? (b) 4 kg? (c) How large is the force?
    Answers: (a) 6 m/s^2 (b) 1.5 m/s^2 (c) 6 N




    2. -



    3. I can't figure out what formula to use and, thus, how to show work. I'm in 11th grade and just start AP Physics two weeks ago. Let's just say I'm extremely confused. Thanks for the help! :)
     
  2. jcsd
  3. Sep 25, 2010 #2

    Doc Al

    User Avatar

    Staff: Mentor

    What law relates force, mass, and acceleration?
     
  4. Sep 25, 2010 #3
    I'm pretty sure it's Newton's second law.
     
  5. Sep 25, 2010 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Exactly! That's all you need to solve this problem.
     
  6. Sep 25, 2010 #5
    so would it be...
    f = m x a
    f = 2 x 3
    f = 6

    (a)
    f= m x a
    6= 1 x a
    a = 6

    (b)
    f= m x a
    6= 4 x a
    a= 1.5

    (c)
    f= 6N

    Oh, wow. That was a lot easier than I thought ahah. Thanks!
     
  7. Sep 25, 2010 #6

    Doc Al

    User Avatar

    Staff: Mentor

    Looks like you got it. :approve:
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook