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Need help with a force vs time graph.

  1. Nov 30, 2007 #1
    [SOLVED] Need help with a force vs time graph. :(

    1. The problem statement, all variables and given/known data
    Which interval in Fig. MC3 corresponds to the greatest change in the speed of the body?
    [​IMG]
    Figure MC3 is above.

    a) 1-2s
    b) 0-1s
    c) 2-3s


    2. Relevant equations

    None

    3. The attempt at a solution

    I figured out that 1-2s has the greatest slope of the three, would that indicate that it has the greatest change in speed? It seems logical to me but I don't really understand this graph, so I don't want to guess and get the wrong answer (this is my last try to get it right). It seems like it would be really simple.
     
  2. jcsd
  3. Nov 30, 2007 #2

    berkeman

    User Avatar

    Staff: Mentor

    Wrong. What is the fundamental equation that relates force, mass and acceleration?
     
  4. Nov 30, 2007 #3
    berkeman has it quite correct. Look at the relationship between force and rate of change of velocity (acceleration).

    P.S. strictly this should be rate of change of momentum, but I won't confuse the issue ;-)

    Edit: also, are you sure that the 1-2 second interval has the highest slope (gradient)? Look carefully.
     
    Last edited: Nov 30, 2007
  5. Nov 30, 2007 #4
    Thank you. :) solved
     
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