Heat Transfer

Heat Transfer

Flow of Heat

Heat is always transferred from warmer objects to cooler objects.

Warm to Cold

• Heat will transfer from warmer objects to cooler objects until those objects reach the same temperature.

• Equilibrium has been met

Multiple Choice

Molecular motion _________ when temperature is increased.

• Increases
• Decreases

Multiple Choice

Heat transfer occurs

• in many directions

• both from warm objects to colder ones and from cold objects to warmer ones

• only from warm objects to colder ones

• only from cold objects to warmer ones

Multiple Choice

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

• It remains cold

• It gets warmer

• It starts boiling

• It starts to freeze

Multiple Choice

When two things are the same temperature:

• They have the same number of molecules

• Their molecules stop moving

• Their molecules move at the same average speed

• Heat transfer between the two things stops

Multiple Choice

On a hot summer day, a student dropped an ice cube onto a park bench. Within minutes, the ice cube melted. Which method of heat transfer best describes the process the student observed?

• radiation
• melting
• conduction
• convection

Multiple Choice

You're holding hands with your best friend.  Your friend's hands are REALLY warm and yours are really cold.  After a few minutes, this has changed.  How might you explain what happened?

• The cold energy from your hand transferred to your friend's hand through conduction.
• The heat energy from your friend's hand transferred to your hand through conduction. 
• The cold energy from your hand transferred to your friend's hand through convection.
• The heat energy from your friend's hand transferred to your hand through convection.

Multiple Choice

If an object has particles that are moving very quickly, the object 's temperature is probably _____.

• cold
• slow
• big
• hot

Multiple Choice

Warm water from the ocean moves to the north while cool waters moves to the south. This is an example of.. 

• Conduction
• Convection
• Radiation

Multiple Choice

Heat transfers from an area of ________temperature to an area of ______ temperature.

• high to low
• low to high
• high to high

Multiple Choice

Warm air rises and the cool air sinks. This is...

• conduction
• convection
• radiation

Multiple Choice

What is the transfer of heat by direct contact?

• Convection
• Electromagnetic waves
• Radiation
• Conduction

Multiple Choice

What is a transfer of heat energy by electromagnetic waves?

• Radiation
• Convection
• Conduction
• Heat

Multiple Choice

What are waves that can transfer heat through the vacuum of empty space?

• Electromagnetic waves
• Convection
• Conduction
• Heat

Multiple Choice

What is the transfer of heat by movement of liquids or gases?

• Radiation
• Convection
• Conduction
• Heat