• Think of ways you can melt an ice cube. At your table in your small groups, come up with a list of 5 or more ideas.

• Make sure you and your group are using quiet voices so tables next to you cannot hear you (now and later in our lesson).

Warm-Up

Energy Transfer• Law of Conservation of Energy- Energy

cannot be created or destroyed.– Types of energy.– Energy changes from one form to

another by these three ways.

1.Conduction

2.Convection

3.Radiation

Conduction• Definition: The transfer of energy from one

molecule to another by direct contact. • When molecules move up against each

other, they pass on energy. – One ball on a pool table hits another. – Hand slapping class experiment.

• Takes place in solid, liquid, and gases.

Ice Cube Experiment - Conduction

• Teams/groups of 2.• Each group gets a Ziploc bag with an ice cube.• Can only use your hands/body to melt ice

cube. (Cannot use heat from mouth). • You also cannot smash the ice cube to make it

melt faster; has to be in one piece. (added). • Estimate time with partner. • Time your experiment- round to nearest

minute.• Write time on board.• Graph your results by taking the average of the

class.

What is conduction?

Convection• Definition: The transfer of energy through

movement of heat by liquid (water) or gas (air).

• Heat moving from one location to another. – Food coloring ice cube experiment. – Balloon blown up and heated by a hair dryer.– Show YouTube video

http://www.youtube.com/watch?v=sZe4QM_N_sw (start at 55 seconds and end at 1:08) (added).

Ice Cube Experiment - Convection• Same team/groups of 2• Each group gets a Ziploc bag with an ice cube• Can only blow heat with your mouth to melt ice cube.• Don’t put ice cube in your mouth; keep it in the bag.• You also cannot smash the ice cube to make it melt

faster; has to be in one piece. (added).• Stay in your seats. (added).• Estimate time. • Time your experiment- round to nearest minute. • Write time on board. • Graph your results by taking the average of the class.

What is convection?

Radiation• Definition: The transfer of energy through

waves.• Transfer of heat without direction contact.

– Radiometer moving because of the heat. – Magnifying glass burning piece of paper

experiment.– Sunburn is an example.

Ice Cube Experiment - Radiation• Same team/groups of 2.• Each group gets a Ziploc bag with an ice cube and

aluminum foil.• Can only use aluminum foil and sun rays to melt ice

cube.• You also cannot smash the ice cube to make it melt

faster; has to be in one piece. (added).• Stay in your seats. (added).• Make your own aluminum foil solar oven.• Estimate time. • Time your experiment- round to nearest minute.• Write time on board.• Graph your results by taking the average of the class.

What is radiation?

Review to Help Remember

• Conduction- The transfer of energy from one molecule to another by direct contact. – Hand slapping experiment.

• Convection- The transfer of energy through movement of heat by liquid (water) or gas (air).– Food coloring experiment.

• Radiation- The transfer of energy through waves.– Radiometer experiment.

Graph Comparison

• In our experiments, by looking at the graph, which heat transfer is the fastest? – Conduction?– Convection?– Radiation?

Wrap-Up- Independently• Define: conduction, convection, and

radiation.• Give one example of each.• When finished, sit at your seat until

dismissed. • When dismissed, hand your paper to Miss

Carrie.