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- 1. Learning Objectives<br />
- 2. Principle of Conservation of Momentum <br />In the absence of an external force, the total momentum of a system remains unchanged.<br />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)<br /> or<br />Total momentum = Total momentum <br /> before collision after collision<br />
- 3. Types of CollisionCase 1 : Elastic Collision<br />The colliding objects move separately after collision.<br />
- 4. u1<br />v1<br />v2<br />u2<br />m1<br />m2<br />m1<br />m2<br /> Before collision After collision<br />Momentum :<br />m1u1 + m2u2 = m1v1 + m2v2<br />
- 5. Types of CollisionCase 2: Inelastic Collision<br />The colliding objects move together after collision.<br />
- 6. u1<br />v<br />u2= 0<br />m1<br />m2<br />m1 + m2<br /> Before collision After collision<br />Momentum :<br />m1u1 + m2u2 = (m1 + m2)v <br />
- 7. Types of CollisionCase 3: Explosion<br />The objects involved are in contact with each other before explosion and are separated after the explosion.<br />
- 8. Before explosion<br />(m1 + m2), u = 0 <br />(m1 + m2)u = m1 v1 - m2v2<br />v1<br />v2<br />m2<br />m1<br />After explosion<br />
- 9. Example 1<br /> Car A Car B<br />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. <br />
- 10. Example 2<br /> Car A Car B<br />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. <br />
- 11. Example 3<br />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.<br />
- 12. What have you learn today?<br />
- 13. Homework!! Smile <br />Teks Book, page 75, no 1-10.<br />Submit: Next week before class.<br />Read subtopic THE CONSERVATION OF MOMENTUM this weekend<br />

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