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The Conservation of Momentum Section 9.2

The Conservation of Momentum Section 9.2. Physics. Objectives. Relate Newton’s third law of motion to conservation of momentum in collisions and explosions. Recognize the conditions under which the momentum of a system is conserved.

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The Conservation of Momentum Section 9.2

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  1. The Conservation of MomentumSection 9.2 Physics

  2. Objectives • Relate Newton’s third law of motion to conservation of momentum in collisions and explosions. • Recognize the conditions under which the momentum of a system is conserved. • Apply conservation of momentum to explain the propulsions of rockets. • Solve conservation of momentum problems in two dimensions by using vector analysis.

  3. Two-Particle Collisions • Newton’s Third Law of Motion: For every action there is an equal but opposite reaction. • In this action-reaction pair; momentum is always conserved. • Law of Conservation of Momentum: The momentum remains the same for any closed system upon which there is no net external force.

  4. Two-Particle Collisions http://www.physast.uga.edu/~jss/1010/ch4/fig5-5.jpg

  5. Law of Conservation of Momentum • pA1 + pB1 = pA2 + pB2 • This states that the momentum of the balls is the same before and after the collision.

  6. Momentum in a Closed System • Internal forces: are pushing against the sides of the flask and the flask is pushing back with the same force. • Closed system: a system that doesn’t gain or lose any mass. http://www.objektnot.com/images/erlenmeyer_flask_with_pennytop_stopper.jpg

  7. Momentum in a Closed System • No system on Earth can be said to be a closed system. • There is always the interaction between the system and the environment.

  8. Practice Problems • Pg. 210 • 7-12 • Pg. 214 • 13-16

  9. Two-Dimensional Collisions • The Law of Conservation of Momentum holds true for one-dimensional collisions and two-dimensional collisions. • Think of Pool… • pA1 = pA2 + pB2 • There are horizontal and vertical components after the collision.

  10. Practice Problems • Pg. 216 • 17-18

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