DCA Week 12 Review

1. DCA Week 12 Review Nov 13, 2012

2. Metals are before the stairs, Nonmetals are after the stairs.

3. Conduction • Examples: • Stirring hot tea with a metal spoon, the spoon then becomes hot, this is called conduction because it CONDUCTED heat.

4. Radiation • Is heat transfer directly from the SUNLIGHT and FIRE. • Examples: • Car warmed by sunlight • Person getting warm outside in the sunlight • Warming hands near a fire place.

5. Heat Transfer • Examples: • Hot marble in cold water, outcome is: marble got cooler while water got warmer. • Hot metal in cold water, outcome is: metal got cooler while water got warmer.

6. Potential & Kinetic Energy • Potential: stored energy • Kinetic: Energy in motion • Examples: • Potential: • Bow and Arrow pulled back • Pulling back a rubber band • Roller coaster at the top before it starts • Batteries have stored energy (potential) as you use the battery, the potential energy is decreasing. • Kinetic: • Ball being thrown • Pouring out water • Roller coaster in motion

7. Good Ways to Investigate Potential & Kinetic Energy • Roller Coaster Lab • Setting up a ramp with a log, ruler, book, wooden board, etc. • Hills, mountains • Water slide

8. Converting Energy: Chemical >>>>>>>>> Electrical>>>>>>>>>>>>>>> Light

9. Energy Transformation Water Generators convert: Mechanical Energy to ELECTRICAL ENERGY

10. Wind Turbine This is used to transfer mechanical energy to electrical energy. Pin Wheels are a good model, BUT: -They don’t produce electrical energy -They can break easily from the wind -Too small to catch wind to produce electricity

11. Potential & Kinetic Energy on a Roller Coaster Potential is the greatest here! Kinetic is the greatest here!

12. Density • Density = Mass Volume