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Getting confused on how to determine which equation to use?

  1. Jan 16, 2014 #1
    So we are talking about velocity and acceleration, as well as the Kinetic Motion equations. Everyone is saying to make a chart, if you will, seeing which variables are present and which one you need. They say this will help you in picking an equation. However, I am still really having a hard time in picking the variables out of a problem...Does anyone have any tips or maybe a sample problem that you could pick the variable out of so I could see a sample?

    Thank you so much!
  2. jcsd
  3. Jan 16, 2014 #2
    I think you need to get a feel for it. You can do this best, in my opinion, by working lots of problems. Nothing beats experience and practice.

  4. Jan 16, 2014 #3


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    Gold Member

    Its so easy,for example,:
    A car initially traveling with a velocity of 100m/s comes to rest in 30s.
    What is the distance travelled during this time?

    The variables here are initial velocity,final velocity and time so you can use ##S=\frac{1}{2}(u+v)t##
    Try to write all the equations and find the one with all the variable in question.
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