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Terminal velocity of a bicycle under a constant force

  1. Nov 23, 2015 #1
    Hello!

    The total force F = m*a applied to the bicycle is F = F1 - a*v^2,
    where F1 is the initial force applied to the bicycle, a is a constant and v is the velocity.
    That means that the total force applied to the bicycle decrease as velocity increases, like a wind resistance decreases acceleration. I know how to find the terminal velocity (maximum velocity that a bicycle can reach under constant initial force), I have to set the total force equal to 0 and then find v.

    But how can I present velocity v as a function of time so I can see how velocity on the graph approaches terminal velocity?

    Sorry if I didn't explain it well, I wrote in intuitively. I am thankful if anyone can help me.
     
  2. jcsd
  3. Nov 23, 2015 #2

    berkeman

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    Staff: Mentor

    Welcome to the PF.

    Thanks for re-posting this here in the Homework Help forums instead of the ME forum. :smile: Next time, though, please fill out the HH Template you are provided when starting a schoolwork thread. It helps to organize your equations and thoughts on the question.

    Now to your question. Use F=ma to give you the acceleration as a function of time a(t) = F(t)/m, and then integrate that to get the velocity v(t). Does that help?
     
  4. Nov 23, 2015 #3

    haruspex

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    it's not quite that simple. v=v(t) will be on both sides of the equation (as dv/dt on the left). So the right hand side cannot be directly integrated. Instead, treat it as a differential equation in v and t.
     
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