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Force of Friction on Boat w/ Thrust

  1. Jan 18, 2015 #1
    1. The problem statement, all variables and given/known data
    A boat moves across the water at a constant 30 mph towards the west. If the motor is generating a thrust of 500 M then the force of friction on the boat must be...
    a. 500 N to the east
    b. 500 N to the west
    c. less than 500 N to the east
    d. less than 500 N to the west

    2. Relevant equations


    3. The attempt at a solution
    I originally thought c, becuase the Ff must be going in the opposite direction of the boat, which would be east, and in order for it to actually be moving, Ff must be less than the thrust of 500 N, pushing the boat to the west.
    C is incorrect though, so now I'm not sure what to think.
     
  2. jcsd
  3. Jan 18, 2015 #2

    haruspex

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    You don't list any relevant equations. You must know one relating force, mass and acceleration.
     
  4. Jan 18, 2015 #3
    Fnet = ma but the question doesn't give me mass or acceleration
     
  5. Jan 18, 2015 #4

    haruspex

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    It does tell you the acceleration. Read it carefully.
     
  6. Jan 18, 2015 #5
    a = 0
    so Fnet = m(0) = 0
    so the answer is a (500 N to the east), because Ff will be equal to the 500 N west
     
  7. Jan 18, 2015 #6

    haruspex

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    Yes.
     
  8. Jan 18, 2015 #7
    Thank you!
     
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