Heat Energy Transfer

Methods of Heat

Transfer

Heat Transfer

 Heat always moves from a warmer

place to a cooler place.

 Hot objects in a cooler room will

cool to room temperature.

 Cold objects in a warmer room will

heat up to room temperature.

Question

 If a cup of coffee and an ice lolly were left

on the table in this room what would
happen to them? Why?

Question

 The cup of coffee will cool until it reaches

room temperature. The ice lolly will melt
and then the liquid will warm to room
temperature.

Multiple Choice

Identify the energies associated with the sun.

• Sound and chemical

• light and heat

• Mechanical and electrical

Multiple Choice

Mrs. Tully's class was investigating the heat flow with warmer objects and colder objects. Sawyer and Brody decided to observe what happened when ice cubes were placed in the palm of their hands. After a few minutes of holding the ice cubes in their hands, the ice cubes began to melt. Then the boys began to complain that their palms were freezing. Mrs. Tully told Sawyer and Brody to put their ice cubes away and write a conclusion based on their observations. Using what you know about heat transfer, choose the BEST conclusion statement for their investigation.

• The heat from the palms of their hands transferred to the ice cubes.

• The ice cubes evaporated, changing from a liquid to a gas.

• There was no change in the ice cubes - they remained solids.

• The cold from the ice cubes turned the palms of their hands red.

Multiple Choice

Heat always passes from a _____________________ object to a __________________ object until all objects are the same temperature.

• positive, negative

• lower, higher

• warmer, cooler

• Celsius to Fahrenheit

Methods of Heat Transfer

Heat energy is transferred in

three ways:

Conduction

Convection

Radiation

CONDUCTION

 Heat is transferred from one particle of matter to

another in an object without the movement of the
object.

 Conduction = CONTACT

Metals are different

The outer e______ of metal atoms
drift, and are free to move.

When the metal is
heated, this ‘sea of
electrons’ gain k_____
energy and transfer it
throughout the metal.

Insulators, such as w___ and p____, do not
have this ‘sea of electrons’ which is why they
do not conduct heat as well as metals.

lectrons

inetic

ood

lastic

Why does metal feel colder than wood, if they
are both at the same temperature?

Metal is a conductor, wood is an insulator. Metal
conducts the heat away from your hands. Wood
does not conduct the heat away from your hands as
well as the metal, so the wood feels warmer than
the metal.

EXAMPLE OF CONDUCTION

 A piece of cheese melts as heat is transferred from

the meat to the cheese (Contact)

Multiple Choice

_____________________ is how heat transfers through direct contact with objects that are touching.

• conduction

• convection

• radiation

Multiple Choice

How does heat energy move through solids?

• Conduction

• Convection

• Insulation

Multiple Choice

Fill in the blank.

A good conductor is something that heat can move through __________.

• Easily

• Hard

Multiple Choice

Fill in the blank.

A good ________ is something that heat cannot move through easily.

• insulator

• conductor

Multiple Choice

Heat always moves from the ________ object.

• lighter to the heavier

• smaller to the larger

• darker to the lighter-colored

• warmer to the cooler

Convection

What happens to the particles in a liquid or a
gas when you heat them?

The particles spread out and

become less dense.

CONVECTION

• Convection is the movement that transfers heat within

fluids and air (gas)

• Heat is transferred by currents within the fluid or gas

• Convection = VENTS (through air and liquid particles)

• Convection moves in

a circular pattern

Fluid movement

Cooler, more d____, fluids
sink through w_____, less
dense fluids.

In effect, warmer liquids and
gases r___ up.

Cooler liquids and gases s___.

ense
armer

ise

ink

Water movement

Hot water

rises

Cooler

water sinks

Convection

current

Cools at the

surface

Why is it windy at the seaside?

Cold air sinks

Where is the

freezer

compartment

put in a fridge?

Freezer

compartment

It is put at the

top, because
cool air sinks,
so it cools the

food on the
way down.

It is warmer

at the

bottom, so
this warmer
air rises and
a convection

current is

set up.

Multiple Choice

________________ is the transfer of thermal energy by particles moving through fluids; liquids and gases are fluids. One natural example of ______________ currents is wind.

• radiation

• conduction

• convection

Multiple Choice

Choose the example that BEST represents CONVECTION.

• Getting a sunburn

• Inflating a hot air balloon

• A microwave oven

• Grilling hamburgers over a charcoal flame

Multiple Choice

How does heat move through a liquid or gases?

• conduction

• convection

• insulation

Multiple Choice

Even though the bottom of a boiling pot gets hot first, all of the water in the pot will soon be the same temperature because of:

• conduction

• convection

• radiation

• thermal expansion

Multiple Choice

Heat is

• the energy transferred between objects

• anything hot

• an object that is warm

• only radiation

Multiple Choice

Hot air 

• rises

• sinks

• smells like sulphur

• stays motionless

Multiple Choice

Cold air

• rises

• sinks

• smells like ice cream

• stays motionless

Multiple Choice

Hot air rising and cold air sinking is an example of

• radiation

• convection

• conduction

• the theory of flatus

Multiple Choice

convection is the transfer of energy through

• the motion of a solid

• the motion of a liquid or gas

• two objects touching

• electromagnetic waves

Multiple Choice

Conduction usually occurs between two

• solids

• liquids

• gases

• plasma

Multiple Choice

Convection occurs between two

• gases

• solids

• liquids

• gases or liquids

Multiple Choice

Thermal energy is

• heat energy

• nuclear energy

• abiotic energy

• massive energy

RADIATION

 Radiation is the transfer of energy by

electromagnetic waves

 Radiation does NOT require matter to transfer

thermal energy

 Radiation = Radiates (heat escaping the sun)

Examples of RADIATION

1.
Fire

2.
Heat Lamps

3.
Sun

Multiple Choice

Identify the energies associated with the sun.

• Sound and chemical

• light and heat

• Mechanical and electrical

Multiple Choice

________________ is how heat travels through empty space and does not require molecules to travel through. Any time you can feel heat without touching it, you are experiencing _____________.

• radiation

• conduction

• convection

Multiple Choice

You and your family are sitting around a campfire. You can feel the heat on your face, even when you back your seat away from the fire. The heat energy from the fire warms your face through:

• conduction

• convection

• radiation

Multiple Choice

During Spring Break, at Mexico Beach, I also got a terrible sunburn! Ouch! This is an example of ________________.

• conduction

• convection

• radiation

Multiple Choice

Heat always passes from a _____________________ object to a __________________ object until all objects are the same temperature.

• positive, negative

• lower, higher

• warmer, cooler

• Celsius to Fahrenheit

Multiple Select

A measure of the kinetic energy of particles is called:

• temperature

• radiation

• heat

• convection

Multiple Choice

The total kinetic energy of particles is:

• conduction

• radiation

• thermal energy

• specific heat

Multiple Choice

The energy that is tranferred between the objects of different temperatures.

• kinectic

• radiation

• heat

• thermal

Multiple Choice

The transfer of energy as electromagnetic waves is called:

• conduction

• radiation

• convection

• thermal

Multiple Choice

Transfer of energy due to the movement of matter.

• heat

• convection

• radiation

• conduction

Multiple Choice

The transfer of energy from one object to another object through direct contect.

• conduction

• convection

• radiation

• thermal

Multiple Choice

Heat from a space heater is:

• radiation

• conduction

• convection

• thermal

Multiple Choice

Toasting marshmellows on a twig is:

• thermal

• conduction

• convection

• radiation

Multiple Choice

Without a potholder, a pot with steel handles will burn us quicker than a pot with rubber handles because of:

• kinectic energy

• thermal energy

• conduction

• convection

Multiple Choice

Even though the bottom of a boiling pot gets hot first, all of the water in the pot will soon be the same temperature because of:

• conduction

• convection

• radiation

• thermal expansion

Multiple Choice

Heat always moves from the ________ object.

• lighter to the heavier

• smaller to the larger

• darker to the lighter-colored

• warmer to the cooler

Multiple Choice

The three main types of thermal energy transfer are

• convolution, conduction, precipitation

• conduction, radiation, convection

• conduction, rapidation, convection

• convection, protection, conduction

Multiple Choice

An example of radiation is

• touching a hot stove

• hot air in motion

• the sun's rays

• cold air sinking

Multiple Choice

Radiation is the transfer of energy through

• the movement of a liquid

• electromagnetic waves

• touching a hot object

• rubbing your hands together

Multiple Choice

Without touching it, a fire transfers heat through

• conduction

• convection

• radiation

• radiation and convection

Multiple Choice

Touching your bare feet on hot sand is an example of

• radiation

• convection

• conduction

• the foreman grill

Multiple Choice

Conduction is the transfer of energy through

• touch or direct contact

• the motion of a solid

• electromagnetic waves

• flatulence

Multiple Choice

What is the main source of energy for planet Earth?

• the sun

• the moon

• volcanoes

• cows

Multiple Choice

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

• Radiation

• Convection

• Conduction

• Heat

Multiple Choice

What is a substance that does NOT conduct heat well?

• Conductor

• Insulator

• Convector

• Radiator

Multiple Choice

What is a substance that DOES conduct heat well?

• Conductor

• Insulator

• Convector

• Radiator

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

Thermal energy being transferred from a hot mug of cocoa to the table it is sitting on is an example of __________.

• convection

• conduction

• radiation

• chemistry

Multiple Choice

Ironing a shirt is an example of:

• condensation

• evaporation

• conduction

• convection

Multiple Choice

You and your friends are gathered around a campfire to keep warm. How is heat being transferred to you?

• conduction

• convection

• radiation

Multiple Choice

Heat transfer in boiling water.

• Conduction

• Convection

• Radiation

Multiple Choice

The condition where two substances in physical contact with each other exchange no heat energy. They are said to be the same temperature.

• Thermal Energy

• Cooler to Warmer

• Energy Transfer

• Thermal Equilibrium

Multiple Choice

heat always travels from _____ to ______ objects

• hot to cold

• cold to hot

• cold to cold

• hot to hot

Multiple Choice

What happens to the temperature if I add ice cubes to a glass of soda

• The heat transfers from the coke to the ice

• The heat transfers from the ice to the coke

Multiple Choice

You leave your cold spoon in a hot bowl of oatmeal. What happens after an hour?

• The temperature of both the oatmeal and the spoon stay the same

• The spoon and the oatmeal become the same temperature

• Only the temperature of the oatmeal will change

• Only the temperature of the spoon will change

Multiple Choice

Johnny put ice in his water. Which idea do you think best explains why the water got cold?

• The coldness from the ice moved into the water

• The coldness and the heat moved back and forth until the water cooled off.

• The heat from the water moved into the ice.

• The water does not cool of

Multiple Choice

Heat always moves from _____________ to ______________.

• cold; hot

• cold; cold

• hot; cold

• hot; hot

Multiple Choice

After taking a hot shower, James steps out of the shower onto the tile floor. The tile felt cold to his feet. Which explanation below best describes James' experience?

• Heat from his feet is transferred to the tile floor

• Heat from the tile floor is transferred to his feet

• Cold from the tile floor is transferred to his feet

• Cold from his feet is transferred to the tile floor

Multiple Choice

When holding a cup of ice water, your warm hand becomes cold. How does the heat transfer?

• From the cold cup to your hand

• From the cold cup to the warm air

• From the ice to your hand

• From your warm hand to the cold cup.

Multiple Choice

Heat transfer by convection happens when:

• there is a circulation of hot air/water rising and cold air/water sinking

• there is space that heat travels through in waves outwardly

• two objects are touching and heat moves from one object into the next object.

Multiple Choice

All metals are examples of good:

• insulators of thermal energy

• conductors of thermal energy

Multiple Choice

What is the original source of the most of the energy that people use?

• By radiation from the sun.

• By convection from the sun.

• By radiation from the Earth's core.

• Conduction from Earth's core.

Multiple Choice

Which best explains how this roasting marshmallows happens?

• Heat from the fire is conducted into the marshmallow.

• Heat from the fire is radiated into the marshmallow.

• The coolness of the marshmallow is conducted into the fire.

• The coolness of the marshmallow is radiated into the fire.

Multiple Choice

Which best describes heat transfer by radiation?

• A slice of bacon frying in a pan.

• A pot on a stove boiling water.

• Cooking a hotdog in a microwave.

• A hot air balloon.

Multiple Choice

When choosing materials to build a fireplace, why is brick a better choice than metal?

• Brick is a conductor.

• Brick is heat resistant.

• Metal is a conductor.

• Meat is heat resistant.

Multiple Choice

Which of the following best describes CONVECTION?

• When heat is transferred through waves.

• When heat is transferred through objects that are touching.

• The movement of gas or liquid in which warmer parts move up and the colder parts moves down.

Multiple Choice

What kind of heat transfer is occurring when the sun warms the sand?

• Conduction

• Convection

• Radiation

• All of them

Multiple Choice

Which of the following is an example of convection?

• Hair dryer is drying up your hair

• When a car engine turns hot after being turned on.

• A spoon placed in the cup filled with cold coffee.

• Boiling spaghetti noodles in water.

Multiple Choice

What heat transfer happens when you put the pan in the open stove?

• Conduction

• Convection

• Radiation

• None

Multiple Choice

Warm air rises and the cool air sinks demonstrates this type of heat transfer.

• Conduction

• Convection

• Radiation

Multiple Choice

The transfer of thermal energy from one object to another is called _________.

• heat

• temperature

• radiation

• potential

Multiple Choice

Thermal Energy is

• the energy of electrons moving through a circuit

• the energy stored due to its position

• the energy of particles in motion which can be described as heat

• the energy of moving downhill