Momentum and Collisions

1
Momentum and Collisions

• Momentum mass x velocity
• pmv Units kgm/s
• Momentum is a vector- Direction matters! Be
  careful when entering the velocity!
• Impulse- the change in momentum caused by a net
  force acting on the system.
• JFDt mDv
• Dv v-v0

2
Collisions

• Two major types, Elastic, Inelastic
• Momentum is conserved in collisions.
• Momentum BeforeMomentum After
• Elastic Collision
• Objects bounce off of each other
• No lasting deformity
• No heat generated
• Kinetic Energy is also conserved

3

• Inelastic Collisions
• Lasting deformity occurs
• Objects either stick together at the beginning
  and separate, or
• stick together at the end.
• Kinetic Energy is not conserved, since there is
  energy lost to heat.