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Newton laws application

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  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

    N0qBHe4NTfSZRb2T4bpH.png

    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.
     
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