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**Chapter 9 9-2 Momentum and Its Conservation**

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**9.2 Conservation of Momentum**

System is a defined collection of obj ects.

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**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.

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**Figure 9-5 p 181 shows momentum.**

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**Law of Conservation and Momentum**

Momentum of any closed, isolated system does not change. Fig pa + pb = pa + p b mava + mbvb = mava + mbvb

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**This fig. shows that when cars A & B collide, p is conserved.**

Example Problem 209 Practice Problems 210

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**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.

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**Conservation of Momentum in Two Dimensions**

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.

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

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**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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