Momentum2
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Momentum2

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Momentum2 Momentum2 Presentation Transcript

  • Learning Objectives
  • Principle of Conservation of Momentum
    In the absence of an external force, the total momentum of a system remains unchanged.
    If no external force acts on a system, the total momentum before collision (or explosion) is equal to the total momentum after collision (or explosion)
    or
    Total momentum = Total momentum
    before collision after collision
  • Types of CollisionCase 1 : Elastic Collision
    The colliding objects move separately after collision.
  • u1
    v1
    v2
    u2
    m1
    m2
    m1
    m2
    Before collision After collision
    Momentum :
    m1u1 + m2u2 = m1v1 + m2v2
  • Types of CollisionCase 2: Inelastic Collision
    The colliding objects move together after collision.
  • u1
    v
    u2= 0
    m1
    m2
    m1 + m2
    Before collision After collision
    Momentum :
    m1u1 + m2u2 = (m1 + m2)v
  • Types of CollisionCase 3: Explosion
    The objects involved are in contact with each other before explosion and are separated after the explosion.
  • Before explosion
    (m1 + m2), u = 0
    (m1 + m2)u = m1 v1 - m2v2
    v1
    v2
    m2
    m1
    After explosion
  • Example 1
    Car A Car B
    Car A of mass 100 kg travelling at 30 m s-1 collides with Car B of mass 90 kg travelling at 20 m s-1 in front of it. Car A and B move separately after collision. If Car A is still moving at 25 m s-1 after collision, determine the velocity of Car B after collision.
  • Example 2
    Car A Car B
    Car A of mass 100 kg travelling at 30 m s-1 collides with Car B of mass 90 kg travelling at 20 m s-1 in front of it. Car A is pulled by Car B with a velocity of 25 m s-1 after collision. Determine the common velocity of Car A and B after collision.
  • Example 3
    A bullet of mass 2 g is shot from a gun of mass 1 kg with a velocity of 150 m s-1 . Calculate the velocity of the recoil of the gun after firing.
  • What have you learn today?
  • Homework!! Smile 
    Teks Book, page 75, no 1-10.
    Submit: Next week before class.
    Read subtopic THE CONSERVATION OF MOMENTUM this weekend