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Homework Help: Calculating fn on a curved ramp.

  1. Dec 15, 2012 #1
    1. The problem statement, all variables and given/known data

    A car is elastically launched up a ramp and we are required to calculate the normal force of the car at certain heights up the ramp.

    2. Relevant equations

    3. The attempt at a solution
    I am able to calculate the elastic potential energy of the car during launching and i know when it reaches the targeted height it will momentarily stop and at that point all the energy is Eg. I am to calculate the vertical height and i need the ø to find fn for at that point fn is mgcosø. Any ideas how i can solve and find fn for different positions on the ramp? Maybe i am thinking about this wrong.
    Thank you for your help
  2. jcsd
  3. Dec 15, 2012 #2
    What kind of ramp is this exactly?

    EDIT: Just saw in the title that it's curve. Assuming you mean a loop, the hint is that you know what F = ma is.
  4. Dec 15, 2012 #3
    I know when it reaches that certain height it will be at rest, so fnet is zero, so acceleration is zero. but i know at the beginning fnet is fx, fx = ma?
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