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How do I interpret this graph?

  1. Nov 13, 2015 #1
    1. The problem statement, all variables and given/known data

    So should i take the area under the graph or something
    2. Relevant equations
    And is in the future i Tackle such problems what are the key thing to remember



    3. The attempt at a solution

    Tried subtracting the areas no use xd
     

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  2. jcsd
  3. Nov 13, 2015 #2

    SteamKing

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    Well, what do you know about how force relates to the motion of an object?

    Trying random things with a graph rarely leads to anything useful, unless you know something about the physics of what is going on.
     
  4. Nov 13, 2015 #3
    Well i know that Force * time leads to mass delta velocity
     
  5. Nov 13, 2015 #4

    haruspex

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    Have you done any work with integrals and areas? Integrals and force, momentum and time?
     
  6. Nov 13, 2015 #5

    SteamKing

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    And what sort of calculations did you do with this knowledge, using the graph as a source of data?
     
  7. Nov 13, 2015 #6
    I added up the areas of the triangle and tapezium
     
  8. Nov 13, 2015 #7
    And i have not done integrals. I have to solve it with a 9th graders knowledge
     
  9. Nov 13, 2015 #8

    SteamKing

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    Can you share these calculations?
     
  10. Nov 13, 2015 #9
    As much as i can do
     

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  11. Nov 13, 2015 #10

    SteamKing

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    Everything looks OK with your calculations, you just need to put them together.

    For the first part of the calculation, you are told that the toy car is at rest initially, so this means that v(t) = 0 m/s when t = 0 sec.

    What would be the velocity of the car after 4 seconds, using your figures for the change in velocity?

    Don't forget to use the mass of the toy car!
     
  12. Nov 13, 2015 #11
    Yup got it 6.5 i cap is the answer
     
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