What do all of these things have in common?

1. What do all of these things have in common? They are types of energy

2. Definitions • Energy • Kinetic energy • Potential energy • Law of conservation of energy

3. Warm Up #1 • What is the energy possessed by matter due to its motion called? • What are the two main types of energy? • Give unique examples of the two main types of energy. • Look at your activity from yesterday. Did it follow the law of conservation of energy? What is your evidence?

4. Mechanical Energy • Definition • Kinetic energy – how do you increase? • Faster • Larger objects (more mass) • Potential energy – how do you increase? • Put more in the “bank”

6. Conservation of Energy • Can’t create or destroy energy • Total is the same • Ski hill • Energy at the top • Energy in the middle • Energy at the bottom

7. Changes Energy Forms • Happens in all changes • Spreads out • Makes things more chaotic • Think of your locker or room

8. Warm Up #2 • Video • What are the major types of energy of the following before the collision and after? • Balloon • Water • Person • What other types of energy are probably present?

9. Mechanical Waves • Transfers energy through a medium • Medium • Definition • Examples • Types • Transverse • Longitudinal • How the matter moves

10. Parts of a Transverse Wave

11. Speed of Waves • Speed = frequency x wavelength v = fl • Speed (m/s) • Wavelength (m) • Frequency (Hertz = Hz = cycles/second) • Find the speed of a wave if it has a frequency of 5 Hz and a wavelength of 12m. • A wave is traveling with a speed of 224m/s. What is the frequency of this wave given its wavelength is 37 m? • Given the frequency is 110Hz and the speed is 1500 m/s, what is the wavelength?

12. Energy in Waves • Which set of “hills” takes more energy to run? • High energy • Short wavelength • High frequency • Large amplitude

13. Clicker Quiz

14. Warm-Up #3 • Take the paper clip and unfold it • Then bend it back and forth over in the same location several times • Place the point where you are bending it on your lips • What do you observe? • What conclusions can you make from your observations and what we have learned in class?

15. Electromagnetic Wave • Definition • Electromagnetic spectrum • Travel at the speed of light (3x108 m/s) • Vary in wavelength and frequency

16. Uses • Radio • Microwave • Infrared • Visible • Ultraviolet • X-ray • Gamma

17. Really Muscular Idiots Visualize Ultra X-treme Grannies

18. Heat • Thermal energy - definition • Heat - definition • Flows from high temp. to low temp. • Beaker example • Compare temperature • Compare thermal energy • How would heat move? (A to B or B to A) Beaker A 100oC 100 mL Beaker B 100oC 50 mL

19. How is Thermal Energy Transferred? • Conduction • Direct contact • Collisions • Changes • High temp. to low temp.

20. Convection • Movement in liquid or gas • Hot liquids • Less dense • Rise • Collides with slower, cooler liquid • More dense • Sinks • Reheated near source • Process repeats • Currents • Oceans • Atmosphere

21. Radiation • Definition • Examples • Car on cold day • T-shirt on sunny day • Greenhouse effect