1. Not finding help here? Sign up for a free 30min 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!

Laws of Motion Problem

  1. Jan 10, 2014 #1
    1. The problem statement, all variables and given/known data

    Two blocks of mass m1 and m2 (m2 = 2 kg ; m1 = 3 kg)are connected with a spring moving on smooth plane. The acceleration of block of mass m2 is 2 ms-2, find acceleration of block with mass of 3kg.

    attachment.php?attachmentid=65491&stc=1&d=1389380017.jpg

    2. The attempt at a solution

    Let external force of F be applied on Block m2.
    ∴ By only considering m2, we get
    F - T = 6
    and for block m1
    T = 2a
    and by newton's law of system (Fnet = m1a1+m2a2+m3a3+........)
    F = 6 + 2a
    But by solving these three equations, i am not getting the answer.
    Plz help...........
    Thanks
     

    Attached Files:

  2. jcsd
  3. Jan 10, 2014 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    hi rajumahtora! :smile:

    (i don't really understand the question, there seems to be something missing, but anyway …)
    shouldn't that be 3a ? :wink:
     
  4. Jan 10, 2014 #3

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    There's no mention of an external force in the OP.
    I think you're getting your m1 and m2 mixed up. m2 needs a net force of 4N.
    Having considered the two masses separately, you are not going to get any additional equations by considering the whole system. If you correct your errors you will find that the whole system equation can be deduced from the other two. In fact, if there is an unknown external force, you do not have enough information to answer the question.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Laws of Motion Problem
  1. Laws of motion problem (Replies: 7)

  2. Laws of motion Problem (Replies: 2)

  3. Laws of motion problem (Replies: 7)

Loading...