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Homework Help: Find angle and speed. Please help!

  1. Sep 23, 2007 #1
    A 8.20-kg block of ice, released from rest at the top of a 1.43-m-long frictionless ramp, slides downhill, reaching a speed of 2.11 m/s at the bottom.

    What is the angle between the ramp and the horizontal?

    What would be the speed of the ice at the bottom if the motion were opposed by a constant friction force of 11.0 N parallel to the surface of the ramp?

    I think I use the equations of ax=gsin(theta) and Fn=mgcos(theta)? I'm not sure what to do. Can someone please help me?

    Thank you!
  2. jcsd
  3. Sep 23, 2007 #2


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    Staff Emeritus
    Science Advisor

    With the acceleration component down the ramp, then find the distance traveled to achieve a velocity of 2.11 m/s. It starts at rest.

    In the second part, the friction works against the weight component acting down the ramp, so the acceleration is less. Find that acceleration and solve as one does for the first part of the problem.
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