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Homework Help: Sliding down incline with friction

  1. Jul 1, 2009 #1
    A 44.9-kg seal at an amusement park slides from rest down a ramp into the pool below. The top of the ramp is 1.80 m higher than the surface of the water and the ramp is inclined at an angle of 33.9° above the horizontal. If the seal reaches the water with a speed of 4.51 m/s, what is the work done by kinetic friction?

    What is the coefficient of kinetic friction between the seal and the ramp?

    i set up a freebody diagram and drew all the forces that would be acting on the seal and listed the known variables, but i cant seem to find a way to connect them all together or find a formula to use to find the work done by kinetic friction or the coefficient of kinetic friction
  2. jcsd
  3. Jul 1, 2009 #2


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    Staff: Mentor

    If there were no friction, what could you say about the starting potential energy PE and the final kinetic energy KE? Since there is work done by friction while the slimy seal slides, how will that affect the KE+PE total throughout the slide?
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