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Non-Equilibrium Applications of Newtons Laws

  1. Oct 1, 2009 #1
    1. In the drawing, the weight of the block on the table is 388 N and that of the hanging block is 175 N. Ignore all frictional effects, and assuming the pulley and the cord to be massless. Find the acceleration of the two blocks as well as the tension in the cord

    2. Fnet = mass of the object * acceleration

    3. The force acting on the hanging block is gravity which has a magnitude of 9.8 m/s/s, and the mass is 17.86 kg. So the net force, which is just equal to the gravitational force, would be 175 N, which is incorrect. What am I doing wrong?

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    Last edited: Oct 1, 2009
  2. jcsd
  3. Oct 2, 2009 #2


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    There is another force acting on the hanging block. Do you see what it is, from looking at the diagram?

    Hint: what stops the hanging block from falling as if it were dropped?
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