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Homework Help: Catapult Physics

  1. Jun 10, 2007 #1
    1. The problem statement, all variables and given/known data

    How simple mechanics equations can be used to describe force, acceleration, speed, distance, etc. of a catapult.

    2. Relevant equations

    This is my question. I have the time and distance travelled already, I'm hoping for some help as to what formulas to use. I don't need them filled out for me, just some suggestions as to what formulas will describe which parts

    3. The attempt at a solution

    Not necessary, just some general formula help...I am fine with formulas and explanations based on formulas once I get them, but my formulas were all in my physics book, which I no longer have.
  2. jcsd
  3. Jun 10, 2007 #2
    do u mean the catapult itself or the thing it throws?
  4. Jun 10, 2007 #3
    The projectile being thrown.
  5. Jun 10, 2007 #4
    if u neglect air friction u can use consevation of energy,

    then u have the basic projectile equations which are similar to one dimentional kinematics equatios:

    range = v(x) * time
    [v(y)(final)]^2 = [v(y)(initial)]^2 + 2*g*h
    delta y= [v(y)(initial)]*t + (g*t^2)/2
    and u can always use x=v*t

    u can also use conservation of the momentum for relative movements of the projectile and the catapult itself
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