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Conservation of Linear Momentum
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  1. Conservation of Linear Momentum Objective: Analyze and solve problems related to elastic and inelastic collisions related to change in momentum.

  2. Reminders • Rocket Lab due Wednesday! • Extra Credit for seeing “Emma” • Ch 9 HW Quiz Tuesday 11/12 • Energy and Momentum Exam Friday 11/15

  3. Linear Momentum • Momentum is a measure of how hard it is to stop or turn a moving object. • p = mv (single particle) • P = Σpi (system of particles)

  4. Problem: A 90-kg tackle runs north at 5.0 m/s and a 75-kg quarterback runs east at 8.0 m/s. What is the momentum of the system of football players? Objective: Analyze and solve problems related to elastic and inelastic collisions related to change in momentum.

  5. Problem: An 85-kg lumberjack stands at one end of a floating 400-kg log that is at rest relative to the shore of a lake. If the lumberjack jogs to the other end of the log at 2.5 m/s relative to the shore, what happens to the log while he is moving? Objective: Analyze and solve problems related to elastic and inelastic collisions related to change in momentum.

  6. Problem: Two blocks of mass 0.5 kg and 1.5 kg are placed on a horizontal, frictionless surface. A light spring is compressed between them. A cord initially holding the blocks together is burned; after this, the block of mass 1.5 kg moves to the right with a speed of 2.0 m/s. A) What is the speed and direction of the other block? B) What was the original elastic energy in the spring? Objective: Analyze and solve problems related to elastic and inelastic collisions related to change in momentum.

  7. Conservation of Linear Momentum • The linear momentum of a system is conserved unless the system experiences an external force. Objective: Analyze and solve problems related to elastic and inelastic collisions related to change in momentum.

  8. Problem: A 1.5 kg cart traveling at 1.5 m/s collides with a stationary 0.5 kg cart and sticks to it. At what speed are the carts moving after the collision?

  9. Problem: A 1.5 kg cart traveling at 1.5 m/s collides elastically with a stationary 0.5 kg cart. At what speed are each of the carts moving after the collision?

  10. Problem: What is the recoil velocity of a 120-kg cannon that fires a 30-kg cannonball at 320 m/s?