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!

Newton laws application

  1. Oct 30, 2015 #1
    I have been preparing for a 9 Th grade talent exam and i can get my head around this problem


    I keep getting the same answer 5, i used fbd

    The answer is 7 ; help me out where am i wrong
  2. jcsd
  3. Oct 30, 2015 #2
    The static friction between the lower block and the table is also affected by the weight of the top block.
  4. Oct 30, 2015 #3
    aah forgot bout that
  5. Oct 31, 2015 #4
    You wouldn't have forgotten if you had drawn a free body diagram.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook