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Physics Assignment Sheet – CONSERVATION LAWS Energy and Momentum TEXT: COLLEGE Physics, 7th Ed., Serway and Faughn, Chapters 5, 6 Objectives for Concept Learning: After studying this unit, you should be able to do the following: 1. Define work based on the force that is doing the work. 2. Identify the sign of work depending on the direction of the force relative to displacement. 3. Understand how work changes the energy of a system. 4. Visualize the meaning of kinetic energy and know how to calculate it. 5. Distinguish: the energy value at an instant versus the change in energy. 6. Understand how potential energy relates to work: W c = -∆PE 7. Visualize the difference between a conservative and a nonconservative force. 8. Be able to calculate both gravitational and elastic potential energy. 9. Understand that energy is relative: PE must have a reference level. 10. Distinguish between Hooke's Law for ideal springs and the elastic potential energy equation for ideal springs. 11. Apply conservation of mechanical energy for many different types of problems. 12. Understand power as a rate of energy delivery. The following are not required until Chapter 6 is complete: 13. Visualize the meaning of momentum. 14. Understand momentum as a vector quantity (energy is a scalar). 15. Define impulse; understand how impulse changes momentum. 16. Apply momentum conservation in a collision or explosion application. 17. Be able to tell in a problem where you may apply conservation of energy and where you may apply conservation of momentum. 18. Know the difference between elastic and inelastic collisions. 19. Know how to calculate the loss of mechanical energy during a collision. 20. Predict the motion that results from a 2-dimensional, glancing collision. The Table on the next page just shows where the textbook reinforces each major concept with practice problems. The odd ones let you check yourself with answers in the back of the book. The first test on Conservation Laws will be December 7 and will cover the Chapter 5 sections. In the objectives above, that will not include momentum and impulse but will include power. There will be another test later that will cover both Chapters 5 and 6. The two topics are inseparable. The problems that combine both topics are labeled on the next page with the instruction to Become Invincible Now. #56 from Chapter 6 happens to be my favorite, and its hints will be on Edlio. Topic 1 Topic Sections 5.1, 5.2 Work Energy Theorem PROBLEMS/QUESTIONS Ch. 5: 1-17 odd 2 Section 5.3, 5.4, 5.7 Potential Energy Ch. 5: 19-25 odd 3 5.4’s examples in text and section 5.5 Applying Conservation of TME Ch. 5: 27-47 odd 63, 69, 71, others of your choosing 4 5 6 7 5.6 - Power Section 6.1 and 6.2 Impulse and momentum Notice the similarity to Assn. 1: Work is to impulse as KE is to momentum Section 6.3 - read critically and conceptually. Do not memorize the formulas of this section. Instead, apply the strategy in green on page 173 Make rules to recognize when a situation calls for Conservation of Energy and when a situation calls for Conservation of Momentum. Only people who do this have successfully completed the unit. LABS/HANDOUTS Work-Energy Theorem: Find k on my taped air track Vertical Stable Equilibrium with PEelas and PEgrav, a bungee jumper Problem 69 is Broken Down in a set of notes This is the heart of Chapter 5. Mastering Chapter 5 means full self-sufficiency in this area right here. Ch. 5: 49, 51, 53 Ch. 6: 1 thru 17 odd Worksheet 6.1 and 6.2 My Red Car/Blue Car model and its associated packet Chap 7: 19 thru 45 odd Review Problems – Become invincible now Ch. 6: 47, 48, 52, 55, 56, 58, 74, 67, 72 Experiment: Ballistic Pendulum Energy Stored in a Crossbow Interactive Physics: Collision Energy Before and After Two months from now, the successful people will still know to use these conservation laws when the situation calls for it. They will recognize without clues or hints which situation calls for conservation of momentum and which calls for conservation of energy. Calendar: 12/3: Practice on Topics 1, 2, and 3 above 12/3: Formulating Elastic PE on a spreadsheet 12/7: Chapter 5 Test You’ll be tested on Chapter 5 again sometime after 12/6, and it will be mixed in with Chapter 6. Deciding when to apply Conservation of Energy versus when to apply Conservation of Momentum versus when to apply FBD/VI Method versus when to set up Basic Kinematics. When such decisions are makeable by you, you’re working independently as a physicist.