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Chapter 9 9-2 Momentum and Its Conservation

Chapter 9 9-2 Momentum and Its Conservation. 9.2 Conservation of Momentum. System is a defined collection of obj ects. Newton’s 3rd Law & Momentum. Impulse-Momentum Theorem is another way of stating Newton’s 3rd Law. A system is isolated if no net external forces acts on it.

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Chapter 9 9-2 Momentum and Its Conservation

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  1. Chapter 99-2Momentum and Its Conservation

  2. 9.2 Conservation of Momentum • System is a defined collection of obj • ects.

  3. Newton’s 3rd Law & Momentum • Impulse-Momentum Theorem is another way of stating Newton’s 3rd Law. • A system is isolated if no net external forces acts on it. • The momentum is conserved.

  4. Figure 9-5 p 181 shows momentum.

  5. Law of Conservation and Momentum • Momentum of any closed, isolated system does not change. • Fig 9-5 207 • pa + pb = pa + p  b • mava + mbvb = mava  + mbvb 

  6. This fig. shows that when cars A & B collide, p is conserved. Example Problem 209 Practice Problems 210

  7. Internal and External Forces • Internal forces cannot change total momentum. • External forces the system is not closed and momentum is not conserved. • It’s important to define a system carefully. • The total momentum of an isolated system is constant.

  8. Ex Pr Recoil 212 Prac Pr 213 Conservation of Momentum in Two Dimensions • Total momentum is the vector sum of the momenta of all the parts of the system.

  9. Figure 9-10 p 214 Ex Problem 215-6 Prac Pr 216

  10. 9.2 The Conservation of Momentum • Newton’s 3rd law is another statement of the law of conservation of momentum. • The law of conservation of momentum states: In a closed, isolated system, the total momentum of the system does not change. • The momentum of a system changes when it is not isolated, that is, when a net external force acts on it.

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