Conservation of Momentum Lecture Notes

Introduction

• Topic: Conservation of momentum using a skateboard
• Key Speaker: Mr. P

Momentum Basics

• Definition: Momentum = Mass x Velocity
  • Both momentum and velocity are vectors.

Conservation of Momentum

• Principle: True in all isolated systems.
• Isolated System: Net force on the system = 0
  • Sum of all forces acting on objects in the system = 0
• Equations:
  • Net force = Change in momentum / Change in time
  • Change in momentum of the system = 0
  • Initial Momentum = Final Momentum
• Summary:
  • Conservation of momentum applies during all collisions and explosions.

Demonstration: Skateboard and Medicine Ball

• Scenario: Skateboard and medicine ball act as a physics "explosion."
  • Even though not a typical explosion, fits physics definition.
• Initial Momentum:
  • Before the 'explosion', initial velocity = 0, hence initial momentum = 0.
• Final Momentum:
  • Ball moving left means negative momentum.
  • To balance to zero, the person on the skateboard moves right with positive momentum.

Rocket Analogy

• Mechanism: Rocket fuel ejected downward, rocket moves upward due to conservation of momentum.
• Hose Spray Nozzle Illustration:
  • Water ejected downward = negative momentum.
  • Nozzle moves upward = positive momentum.

Class Participation

• Discussion:
  • Bo brings a rooster stuffed animal as part of the class activity.
  • Bobby discusses the direction of momentum.

Conclusion

• Appreciation: Thankfulness for learning together.
• Note: Use of humor and engagement in teaching style.