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Do Now 1. Describe what happens during collisions A & B. 2. Label collisions A & B as elastic or inelastic. A B Homework :D Physics to Go 3-6 2. Quiz 3-6 Due TODAY! 1. Quiz 3-3 & 3-4 Corrections Monday February 29th Tuesday March 1st Objectives 3-6 We are learning… In all collisions, the total momentum before the collision is equal to the total momentum after the collision. This law of conservation of momentum is true of collisions from planets to microscopic particles 1.What laws of physics are BIG Question used traffic-accident We will be by successful when we can… investigators tothe reconstruct Understand and apply law of conservation of momentum to collisions an accident? Measure the momentum before and after a moving mass strikes a stationary mass in a head-on collision Agenda • Do Now 5 • Physics Talk 15 • Practice 20 • Checking Up 5 Elastic vs. Inelastic Conservation of p Problem 1: A boy and girl are riding in go karts at an amusement park. A 75 kg boy and car are moving at 3 m/s toward a 50 kg girl and car who are moving toward him at 1.8 m/s. If they catch up, stick together, and then move away together, what is their final velocity? Conservation of p Problem 2: A steel ball with a mass of 2 kg is traveling at 3 m/s. It collides with a stationary ball that has a mass of 1 kg. Upon collision, the smaller ball moves at 4m/s. What is the velocity of the larger ball? Checking Up 3-6