Energy

What is Energy?

• The ability to do work

• the ability of things to move

• Electrons moving to create electricity

• Heat

What is conduction?

• Heat transfer through direct touching

• heat transfer from waves

• air or liquids

• heat transfer from changes in density

What is convection

• heat transfer from direct touch

• heat transfer from heat or light waves

• heat transfer common in liquids and air as density changes

• sunbathing outside

What is thermal radiation?

• heat transfer from direct touch

• heat transfer from heat waves / light waves

• heat common from changes in density in liquids or air

• heat from touching the cookies straight out of an oven

Why does air from an air conditioner sink to the floor?

• Because of convection, cold air is more dense than hot air, so it sinks in air.

• Because of radiation, cold air is more dense than hot air, so it sinks in air

• Because of convection, hot air is more dense than cold air, so it sinks in air.

• Because of radiation, hot air is more dense than cold air, so it sinks in air.

Hot air moves ____ and cold air moves ____

• up, down

• down, up

• sideways, waves

• waves, sideways

Which is not a type of energy?

• Thermal

• Electromagnetic

• Nuclear

• Bipolar

Why does ice float?

• It is less dense than water.

• It is more dense than water.

• due to the hot water rising and holding up the ice cubes.

• due to the cold water rising and holding up the ice cubes.

True or false, Radiation, conduction, and convection are the three ways that heat energy is transferred.

• True

• False

Which is an example of kinetic energy?

• Heat rising from a boiling pot.

• A car moving down the freeway at 60mph.

• A bolder about to fall off a cliff.

• Electricity flowing through an electrical cable.