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Minumum velocity when entering a loop?

  1. Nov 13, 2011 #1
    A small object goes down a ramp and through a loop with a 2 metre diameter. In order to complete the loop, what is the minimum speed the object must have when reaching the bottom of the ramp? (consider there is no friction)

    a) 5 m/s
    b) 0 m/s
    c) 3 m/s
    d) 7 m/s


    I'm a bit clueless on this one, I think a minimum speed has to be stronger then the gravity force, but non of those values make sense to me.
     

    Attached Files:

  2. jcsd
  3. Nov 13, 2011 #2
    Use (a) Fnet = ma at the top of the circle and
    (b) conservationof energy at top and bottom of the circle.
     
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