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Published byChristopher Schmidt Modified over 2 years ago

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

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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 = p a + 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. Its 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 Total momentum is the vector sum of the momenta of all the parts of the system. Ex Pr Recoil 212 Prac Pr 213

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Figure 9-10 p 214 Ex Problem Prac Pr 216

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9.2 The Conservation of Momentum Newtons 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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