DCA Week 12 Review

Nov 13, 2012

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

Conduction

• Examples: – Stirring hot tea with a metal spoon, the spoon

then becomes hot, this is called conduction because it CONDUCTED heat.

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.

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.

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

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

Converting Energy:

Chemical >>>>>>>>> Electrical>>>>>>>>>>>>>>> Light

Energy Transformation

Water Generators convert:

Mechanical Energy to ELECTRICAL ENERGY

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

Potential & Kinetic Energy on a Roller CoasterPotential is the greatest here!

Kinetic is the greatest here!

Density

• Density = Mass Volume