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!

Inelastic collision of a cannonball

  1. Mar 8, 2016 #1
    1. The problem statement, all variables and given/known data
    CRsm8fL.png
    2. Relevant equations
    Total initial momentum = total final momentum
    Momentum = m*v
    Kinetic energy = 1/2 * m * v2

    3. The attempt at a solution
    What I found so far:
    m1v1i = (m1+m2)vf
    Total kinetic energy = 1/2 * (m1 + m2)vf2 - 1/2 * m1 * v1i2

    I am confused on how friction comes into play here. I know that friction is a non-conservative force.
     
  2. jcsd
  3. Mar 9, 2016 #2

    ehild

    User Avatar
    Homework Helper
    Gold Member

    You can take the whole process as two stages.
    The cannonball hits the tank, and is embedded. What kind of collision is this? Is energy conserved?
    After the collision, the tank and the ball inside, move on a rough pavement and come to rest at 50 cm distance. What kind of motion is that?
     
  4. Mar 9, 2016 #3

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    The energy imparted to the tank by the projectile must be used to move the tank against the friction which exists between the tank and the pavement. In essence, part of the energy of the projectile must be converted to work in order to overcome friction.
     
  5. Mar 9, 2016 #4
    So since this is an elastic collision, momentum is conserved but KE is not. I would have to substitute what I found first into Kf, then that would equal to mu*(total mass)*g*d, correct? I just solve for v initial for the cannon ball. I got 377 m/s.
     
  6. Mar 9, 2016 #5

    ehild

    User Avatar
    Homework Helper
    Gold Member

    The result is correct.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Inelastic collision of a cannonball
  1. Inelastic collision (Replies: 5)

  2. Inelastic collision (Replies: 1)

  3. Inelastic Collision (Replies: 2)

  4. Inelastic collisions (Replies: 4)

  5. Inelastic Collisions (Replies: 2)

Loading...