1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Roller coaster circular motion normal forces

  1. Apr 1, 2008 #1
    1. The problem statement, all variables and given/known data
    A roller-coaster car has a mass of 1200 kg when fully loaded with passengers. As the car passes over the top of a circular hill of radius 17 m, its speed is not changing. (a) At the top of the hill, what is the normal force (using the negative sign for the downward direction) FN on the car from the track if the car's speed is v = 8.2 m/s? (b) What is FN if v = 17 m/s?

    2. Relevant equations
    -Fn= m (-v^2 / R)

    3. The attempt at a solution

    A) 1200(- 8.2^2/ 17)
    -Fn= -4746.352941

    B) 1200(- 17^2/ 17)
    -Fn= -20,400 N
    do not believe these answers are correct, but cannt determine any other way to solve, thanks for the help
     
    Last edited: Apr 1, 2008
  2. jcsd
  3. Apr 1, 2008 #2

    rock.freak667

    User Avatar
    Homework Helper

    Consider the forces acting on the car at the top of the loop. The normal reaction,R, upwards and the weight,W. The resultant of theses 2 provide the centripetal force needed to keep the car on the track. So that resultant force=Weight-Normal Reaction.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Roller coaster circular motion normal forces
Loading...