BrainPop Heat Energy

The coffee keeps cooling off until?

• it reaches the same temperature as the room.
• it coffee becomes cooler than the room.
• someone drinks all of it or spits it out.

What happens when a cold drink sits in a hot room?

• It stays cold.
• It warms up to the temperature of its surroundings.
• It makes you want to spit it out.

In a thermos, a drink can stay hot forever.

• TRUE
• FALSE

What direction does heat (thermal energy) always flow?

• From cooler areas to warmer.
• From warmer areas to cooler.

Temperature measures the average kinetic energy (motion) of all the molecules in an object.

• True
• False

When molecules collide _________.

• the faster molecule slows down and the slower molecule speeds up.
• the faster molecule continues at the same rate and the slower molecule gains energy.

True/False A thermos is basically a "bottle in a bottle." Adding insulation to slow the heat energy transfer.

• TRUE
• FAlSE

As temperature increases, the particles move ________________, becoming less dense than the materials around them.

• faster and spread apart
• slower and contract (move together)

Convection currents occur when colder, less dense fluids rise and warmer, more dense fluids sink.

• TRUE
• FALSE