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Forces question

  1. Sep 27, 2012 #1
    A block of ice of mass m is released from rest at the top of a frictionless ramp of length L. at the bottom of the incline the speed of the ice is v1. given m,L,v1 determine

    the time needed to hit the bottom
    the angle between the ramp and the horizontal
    the accel of the ice

    I made my coordinate system slant at the angle of the ramp because I thought this would make it less work

    http://i.imgur.com/d18GN.png

    (is this okay?)



    x0 = 0
    x = L
    v0 = 0
    v = v1
    a= A
    t = T

    v1 = 0 + AT

    T = v1/A

    v1^2 = 2AL

    A = v1^2 / 2L

    T = v1 / (v1^2 / 2L)

    T = 2L / v1

    I got these answers pretty cleanly but I have no idea what I should be doing to get theta since I dont see a way to get the lengths of the potential triangle with hypoteneus L
     
  2. jcsd
  3. Sep 27, 2012 #2
    What is the acceleration of the ice if it is dropped from rest, free fall?
    If it has to follow the ramp inclination, what is it's acceleration?
     
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