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Homework Help: Projectile Motion Lab

  1. Sep 28, 2005 #1
    I'm having some difficulty doing this lab, so if anyone could point me in the right direction that would be awesome.

    I basically have to determine what angle to set a launcher at so that the projectile will hit a falling target. I have to derive an actual equation. The only measurements I will be able to make is the height of the target (before it falls) and the distance from the launcher to the target.

    I've uploaded a crummy diagram of the set-up:


    http://img323.imageshack.us/img323/1853/untitled5po.png [Broken]


    Remember, the only variable I'll be able to insert values for is 'h' and 'Dx'. I know that I have to start with the five kinematics equations, but I've reached a dead end.

    Has anyone done this lab before? Is anyone able to point me in the right direction?
     
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Sep 28, 2005 #2
    Hmmm....

    Since y=vy(t)-.5gt²
    And since both the bullet and target need to meet at the same level, set the two y values equal to each other?

    vsinθ-.5g(2vy/g)²=vsin0-5g((2y/g)^1/2)²
    The first portion of the equality is the bullet, which follows a Case 2 motion, a parabolic path with an angle and non-zero vy component. The second portion of the equality is the case 1 scenario that the target follows.

    try that out, it MIGHT help out. I don't know for sure of course, but it would be the first thing I would try-keep in mind I don't really know the problem, as in, what you need to show or do.
     
  4. Sep 29, 2005 #3

    hotvette

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