The Conservation of Momentum Section 9.2

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Presentation transcript:

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. Apply conservation of momentum to explain the propulsions of rockets. Solve conservation of momentum problems in two dimensions by using vector analysis.

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.

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

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.

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

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.

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

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.

Practice Problems Pg. 216 17-18