ppt_chapter07.ppt - Raymond A Serway John W Jewett Chapter 7 Conservation of Energy 7.1 Analysis Model Nonisolated System(Energy • In a nonisolated

# ppt_chapter07.ppt - Raymond A Serway John W Jewett Chapter...

• Notes
• 70

This preview shows page 1 - 12 out of 70 pages.

Raymond A. Serway John W. Jewett Chapter 7 Conservation of Energy
7.1 Analysis Model: Nonisolated System (Energy) In a nonisolated system: Energy crosses boundary of the system due to interaction with the environment For example, the work-kinetic energy theorem: Interaction of system with environment is work done by external force Quantity in system that changes is kinetic energy
7.1 Analysis Model: Nonisolated System (Energy) Methods of energy transfer: Work : transfers energy by applying a force and causing a displacement of the point of application of the force Mechanical Waves : allow a disturbance to propagate through a medium Heat : is driven by a temperature difference between two regions in space
7.1 Analysis Model: Nonisolated System (Energy) Matter Transfer : matter physically crosses the boundary of the system, carrying energy with it Electrical Transmission : transfer is by electric current Electromagnetic Radiation : energy is transferred by electromagnetic waves
7.1 Analysis Model: Nonisolated System (Energy)
7.1 Analysis Model: Nonisolated System (Energy) Energy is conserved This means that energy cannot be created or destroyed If the total amount of energy in a system changes, it can only be due to the fact that energy has crossed the boundary of the system by some method of energy transfer
7.1 Analysis Model: Nonisolated System (Energy) Mathematically, E system = E system is the total energy of the system T is the energy transferred across the system boundary Note: T work = W and T heat = Q Others do not have standard symbols, so we use: T MW (mechanical waves) T MT (matter transfer) T ET (electrical transmission) T ER (electromagnetic radiation)
7.1 Analysis Model: Nonisolated System (Energy) The primary mathematical representation of the energy analysis of a nonisolated system is If any of the terms on the right are zero, the system is an isolated system The Work-Kinetic Energy Theorem ( K = W ) is a special case of the more general equation above
7.2 Analysis Model: Isolated System (Energy) Isolated system: no energy crosses the system boundary by any method Example: lifting a book in a gravitational field System consists of the book and the Earth Mechanical energy: System is isolated, so Mechanical energy is conserved for isolated system with no noncosernvative forces acting
Problem-Solving Strategy: Isolated System with No Noncoservative Forces: Conservation of Mechanical Energy 1. Conceptualize - Study the physical situation carefully and form a mental representation of what is happening. As you become more proficient working energy problems, you will begin to be comfortable imagining the types of energy that are changing in the system.
Problem-Solving Strategy: Isolated System with No Noncoservative Forces: Conservation of Mechanical Energy 2. Categorize - Define your system, which may consist of more than one object and may or

#### You've reached the end of your free preview.

Want to read all 70 pages?

• Spring '17
• Kawi shinske

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes
Ask Expert Tutors