1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Projectile Motion, Finding the Angle

  1. Oct 6, 2009 #1
    1. The problem statement, all variables and given/known data
    A projectile is fired in such a way that its horizontal range is equal to three times its maximum height. What is the angle of projection?


    2. Relevant equations
    Kinematics Equations


    3. The attempt at a solution
    I'm not even sure where to start. Can someone point me in the right direction?
     
  2. jcsd
  3. Oct 6, 2009 #2

    Delphi51

    User Avatar
    Homework Helper

    Lotta, as soon as you see the word "projectile", separate the initial velocity v at angle A into horizontal and vertical parts. Then write two headings:
    Horizontal and Vertical. Decide in each case whether you have constant speed or accelerated motion and write the appropriate formula(s). Put in the numbers or expressions for all known quantities and look for an equation you can solve.
     
  4. Oct 7, 2009 #3
    ok so I tried fitting the x and y components into various kinematics equations but I can't seem to isolate any variables to find the angle
    I get things like
    19.6h = Vy^2
    or 3h = Vx t
    any hints?
     
  5. Oct 7, 2009 #4

    berkeman

    User Avatar

    Staff: Mentor

    Write out the traditional equations of motion for us for a constant gravitational force. What are the general equations? Now, what constrains this problem? How can you factor those constraints into those equations? Write things out and show us your work.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Projectile Motion, Finding the Angle
Loading...