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How to find acceleration of object without mass?

  1. Jan 21, 2017 #1
    1. A ship is launched into the water down a ramp making an angle of 8 degrees with the horizontal. The coefficient of kinetic friction between the bottom of the ship and the ramp is μk=0.06. What is the acceleration of the ship down the ramp?


    2. I know that the equation to solve this is
    a = gsin(theta) - μkgcos(theta)
    Which gives you 0.8 m/s^2



    3. So, I have the equation to solve it and the correct answer but I'm just not sure how to derive that equation in the first place?
     
  2. jcsd
  3. Jan 21, 2017 #2

    gneill

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    Staff: Mentor

    Hi grbd920, Welcome to Physics Forums!

    Please retain the formatting template headers when you create your homework help requests.

    Draw the FBD for the problem and assign a variable, say M, to the mass. Write the equations. You should find that the M cancels out along the way to the solution.
     
  4. Jan 21, 2017 #3
    Got it! Thank you! :)
     
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