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Hi, I really need help with my homework

  1. Nov 6, 2009 #1
    Hi, I really need help with my homework!!!

    I had a home work, it is like:
    I have a data table, that has

    Initial Position: 1.652m from the sensor
    Final Position: 0.977m from the sensor

    Initial Velocity: 0.003m/s
    Final Position: 1.366m/s

    Angle: 27 degrees
    g = -9.8m/s^2

    U represent the variable for coefficient of friction

    The question asks me to find the coefficient of friction, by using the formula according to the potential energy, it's like

    gh= v^2+ UcosAngle*d*g

    I'm so confused!! Please help me@!!!!
    Thank you in advance!!!
     
  2. jcsd
  3. Nov 6, 2009 #2

    rock.freak667

    User Avatar
    Homework Helper

    Re: Hi, I really need help with my homework!!!

    Just use

    [tex]\frac{1}{2}mv^2 + F_R d = mgh[/tex]


    and find the frictional force FR and then see how FR relates to the coefficient of friction.
     
  4. Nov 7, 2009 #3
    Re: Hi, I really need help with my homework!!!

    thank you !!!
     
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