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Work and Kinetic Energy

  1. Mar 29, 2014 #1
    1. The problem statement, all variables and given/known data
    An ice block is being pushed through a displacement d→=(15m)i -(12m)j along an embankment with rushing water. It exerts F→=(210N)i -(150N)J on block. How much work on block does force do?

    2. Relevant equations
    Pythogoreum equation
    a^2 +b^2= c^2

    3. The attempt at a solution
    I drew i and j coordinates for both displacement vector and force vector. I calculated
    d→=15^2 + 12^2= c^2
    I used same for F→
    (210N)^2 + (150N)^2 = c^2
    c=258.07 N
    (258.07N)* (19.21m) = 4957.52 J
    I think I might have set it up wrong.
  2. jcsd
  3. Mar 29, 2014 #2


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    Hello Richober. Welcome to PF !

    What is the definition of work?

    Not only are force, ##\ \vec{F}\,,\ ## and displacement, ##\ \vec{d}\,,\ ##involved, their relative directions must also be included..
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