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I know the answer but I don't know why!

  1. Jun 19, 2005 #1
    I have a question that asks me to write dv/dt as a function of x.

    I know that dv/dt = vdv/dx

    but I don't know why this is. Could anybody shed some light on this for me? Just so I understand why it is this!!!

    Thanks in advance
     
  2. jcsd
  3. Jun 19, 2005 #2

    dextercioby

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    Did you hear about the chain rule of differentiation...?

    Daniel.
     
  4. Jun 19, 2005 #3
    yeah that though occured to me whilst sitting in the car just.

    but surely theres another term involved in it isn't there?
     
  5. Jun 19, 2005 #4

    dextercioby

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    No.

    [tex] \frac{dv}{dt}=\frac{dv}{dx}\frac{dx}{dt} [/tex].

    Daniel.
     
  6. Jun 19, 2005 #5
    Of course!! What I had in mind was the product rule! Thank you for that - makes so much sense to me now!!!
     
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