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# Momentum2

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### Momentum2

1. 1. Principle Of Conservation Of Momentum In the absence of an external force, the total momentum of a system remains unchanged.
2. 2. •In any collision or interaction between two or more objects in an isolated system , the total momentum of the system will remain constant •that is the total momentum before collision will be equal to the total momentum after the collision
3. 3. ELASTIC After two objects moving with their respective velocities do collide, those two objects will move separately. The total momentum = The total before collision momentum after collision 22112211 vmvmumum
4. 4. Elastic collision
5. 5. 6
6. 6. A trolley of mass trolley 3 kg and moving with a velocity 0.6 ms-1 and collides with a stationary trolley with a mass 2 kg . After collision the trolley of mass 3 kg and moving with a velocity 0.2 ms-1. What is the velocity of the trolley of mass 2 kg after collision?
7. 7. 1 1 1 1 1 2.0 6.0 3 msv msu kgm ))(2()2.0)(3()0)(2()6.0)(3( 2v 22112211 vmvmumum 226.008.1 v 6.08.12 2v ? 0 2 2 2 2 v u kgm 6.0 2 2.1 2v Velocity of trolley, 2 kg
8. 8. INELASTIC After two objects moving with their respective velocities do collide, they stick together and move with a common velocity Based on The Principle Of Conservation Of Momentum, The total momentum = The total momentum before collision after collision vmmumum 212211
9. 9. A trolley of mass 1 kg and moving with a velocity of 6 ms-1 collides with a stationary trolley with a mass 3 kg . After collision they stick together with a common velocity. What is their common velocity?
10. 10. 1 1 1 6 1 msu kgm 0 3 2 2 u kgm vmmumum 212211 ))(31()0)(3()6)(1( v v406 5.1 4 6 vCommon velocity
11. 11. Similarities and Differences differences Elastic collision Total amount of kinetic energy is conserved Inelastic collision Total amount of kinetic energy is not conserved Similarities Total momentum is conserved Total energy is conserved Total mass is conserved
12. 12. Application in real life: •Kicking football •Water hose •Rifle •Playing bowling
13. 13. Diagram below shows object X and object Y before and after an inelastic collision. The mass of object X and object Y are 5 kg and 1 kg respectively. What is the velocity, v of both object after collision, in m s–1?
14. 14. Car A Car B Car A of mass 100 kg traveling at 30 m s-1 collides with Car B of mass 90 kg traveling 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.
15. 15. Car A of mass 100 kg traveling at 30 m s-1 collides with Car B of mass 90 kg traveling at 20 m s-1 in front of it. Car A is pulled by Car B after collision. Determine the common velocity of Car A and B after collision.
16. 16. 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.
17. 17. An arrow of mass 150 g is shot into a wooden block of mass 450 g lying at rest on a smooth surface. At the moment of impact, the arrow is travelling horizontally at 15 ms-1. Calculate the common velocity after the impact.