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Homework Help: Kinetic and Potential Energy with acceleration

  1. Oct 16, 2012 #1
    1. The problem statement, all variables and given/known data
    A 4-kg mass is launched with zero initial velocity on a frictionless circular track. The speed of the mass at point 1 is 20 m/s (base of the curve). The mass then travels along a rough horizontal surface between points 1 and 2 (L-4m, μk=0.3). It then travels up a frictionless slope.

    Part a had me calculate the height is was dropped from using the velocity at point 1 and it came out to a height of 20.41m and the Kinetic Energy at the base was 800J

    Part b) Find the acceleration of the system as it travels from point 1 to 2.

    2. Relevant equations

    3. The attempt at a solution
    I realize that the friction will slow down the velocity over the length but I don't know how to tie the velocity and acceleration together while including friction.
  2. jcsd
  3. Oct 16, 2012 #2


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    welcome to pf!

    hi salthegemini! welcome to pf! :smile:
    nothing accelerates unless there's a force

    to find the acceleration, first find the force :wink:
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