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Homework Help: Magnitude of acceleration

  1. Mar 24, 2010 #1
    Really desperate for some help with this, Thought i had i cracked and quite clearly i don't
    Im very bad with explaining how i arrived at a answer as i make such a mess of my answers and some time just guess as i can't seem to figure it out! Please help
    . What is the magnitude of the acceleration that this force will cause when applied to a car with a mass of 1.1x10³Kg

    Then calculate the final speed of the car (above) assuming that it was standing still initially and that the force of 5.0 x 10³ N is applied for 6.0s

    Why would the car take longer to reach the calculated speed if the car's mass was 1.4 x10³Kg. which part of newtons second law would explain this.

    THANKS in advance .
  2. jcsd
  3. Mar 24, 2010 #2


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    Say flower, why don't you write out the equation for Newton's 2nd law, and the kinematic motion equations, and play around with them for a few minutes, and see what you get. Please show your work and post your results. Then someone will check it for you and provide further assistance.
  4. Mar 24, 2010 #3
    As my mechanics teacher always says - Write down what you know first.

    Force (F) =
    Time (t) =
    Mass (m) =
    Initial Speed (u) =

    You know what all the above are, so fill them in.

    Acceleration (a) =
    Final Speed (v) =

    What equations can you think of relating the 4 above quantities with the above 2 values? As Jay said, think suvat (the one without s as you don't know that) and Newton's 2nd law.
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