1. Have your Homework Notes out to show me – I will stamp them as completed. Turn any other late work into the binder

2. Conservation of Momentum Objective: You will be able to: Relate Newton’s third law to the conservation of momentum in a collision. Recognize the conditions under which momentum is conserved.

3. Bell Ringer Look at your exit card from last lesson. Make corrections – if needed: velocity, momentum, impulse – how are they different. Now add, how are they similar.

4. Demo Observe the demo of Newton’s Cradle and explain what you see.

5. The Law of Conservation of Momentum This law is really a restatement of Newton’s first and third laws. Momentum is conserved in collisions. This means that the total momentum remains the same. The total momentum in an isolated, or closed system is the same after a collision as before the collision, so long as the forces are internal. An inelastic collision has a net loss of energy as a result of the collision. An elastic collision (an idealized situation) assumes no energy is lost.

6. Transfer of Momentum When a moving object hits a second object some or all of the momentum is transferred to the second object. Explained by Newton’s Third Law: action and reaction forces are equal and opposite.Newton’s Third Law

7. Lab: Rebound Height Work through the mini lab on p. 239. Record all data. Compete the three analysis and conclusion questions.

8. Independent Practice Work through worksheet Q1 - 8.

9. Exit ticket! 1. Action-reaction forces are equal/unequal in size and opposite in direction. 2. Momentum is equal to mass times speed/velocity. 3. Momentum is always/sometimes conserved. 4. Now write 2 questions (along with their answers) about conservation of momentum and quiz your partner.

10. Physics HW p. 233 Q 2 + 4