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Block-Work Question

  1. Jan 27, 2017 #1
    1. The problem statement, all variables and given/known data
    Across a horizontal floor,a ##102 kg## block is pulled at a constant speed of ##5.5\frac {m} {s}## by an applied force ##125N## directed ##38^°## above the horizontal.Calculate the rate at which the force does work on the block.
    2. Relevant equations
    ##W=ΔE_k##
    ##E_k=\frac 1 2 mv^2##


    3. The attempt at a solution
    I didnt understand the question.Whats does the Calculate the rate at which the force does work on the block means.Net work must be zero cause object moves in constant speed.So there must be a fricition maybe ?

    Thanks
     
  2. jcsd
  3. Jan 27, 2017 #2

    SammyS

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    The net work done is indeed zero, which can be seen because the speed is constant. As you say, there must be some other force.

    But the question does not ask about the work done by the net force. It asks for the rate of work done by the 125 N force.
     
  4. Jan 28, 2017 #3
    Thanks I solved
     
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