Conservation of Momentum

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Presentation transcript:

Conservation of Momentum Chapter 3, Section 6 Conservation of Momentum

Date: HW: 3.6 PTG #1-16, pg. 319-320 Learning Objective: Describe conservation of momentum in collisions Success Criteria: Calculate momentum in a system Define conservation of momentum in words and equations Do Now: Quiz! WDYS/WDYT pg. 310 Agenda: Do Now PhET/Investigate Physics Talk PTG Summary/Quiz

Investigate: Collision PhET

Mass of Object 1 (kg) Mass of Object 2 (kg) Velocity of Object 1 before collision (m/s) Velocity of Object 2 before collision (m/s) Mass of combined objects after collision (kg) Velocity of combined objects after collision (m/s) 1.0 0.0 2.0 3.0

Momentum p=mv Before Collision After Collision Momentum of Object 1 kg*(m/s) Momentum of Object 2 kg*(m/s) Momentum of Combined objects 1 and 2 kg*(m/s)

DO NOW: Describe what you know about conservation of momentum.

Physics Talk 3.6 What is the Conservation of Momentum? The total momentum before a collision, is equal to the total momentum after the collision if no external forces act on the system.

What is the equation for momentum? What is the equation for conservation of momentum? p=mv p=momentum [kg*(m/s)] m=mass (kg) v=velocity (m/s)

Why is this equation written like this? You added the masses after the collision because they stuck together

Pool ball example Single cue ball hits a rack of 15 balls…momentum is conserved! Total momentum before is equal to the total momentum after the collision The balls move in new directions with new speeds, but the momentum stays the same!

Why is conservation of momentum important? Used to investigate traffic accidents If you know masses and velocities of two objects, you can predict the velocity after the collision…you can predict the future!

Practice Problems PTG pg. 319 #1-16

Essential Questions LO and SC Reflection Answer essential questions pg. 318

Quiz!