LESSON GUIDE
Week 5
PHYSICS
THERMAL ENERGY
YEAR 9
Bell Work
Summary
Sketch the diagram in your books.
Draw an arrow to show the direction of the
energy transfer.
Write a sentence
explaining why you
drew the arrow that
way.
50 oC
30oC
TIME UP!
50 oC
30oC
Transferring Energy
By the end of this week, you
will:
• Describe how energy is
transferred by radiation,
conduction and convection.
• Use the particle model to
explain energy transfers in
matter.
• Compare heat and temperature
•
Link evaporation to heat
Keywords: energy transfer
Thermal
energy, transfer, how it
causes a cooling conduction,
radiation, effect.
convection.
and analyse
Use 3 pages in your exercise book.
At the top of each page write one
of the following;
Conduction,
convection,
radiation You will:
Sketch an image to describe
each.
Define the word.
Explain the process.
By the end of this week, you will:
•
•
•
•
Describe how energy is
transferred by
radiation, conduction
and convection.
Use the particle model
to explain energy
transfers in matter.
Compare heat and
temperature
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Conduction seen!!
Watch the picture on this
slide, video on the next slide
and a picture on slide 7.
Then develop your summary
on conduction as required in
slide 10.
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Conduction Explained.
• Watch the video, watch the pictures that follow and answer questions that follow in the coming slides
Conduction – How does it happen?
(In terms of particles)
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Conduction
• What is it? Define
the word.
• Sketch a labelled
diagram to explain it
• Describe the process.
HINT: Use ‘Particles’.
Gear 3 –
Now,
Make your
summary
notes by
answering the
questions
given on the
left.
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
REFLECTION QUESTIONS
Watch the image and
answer the questions in your
exercise books.
1. Which particles become
hot first?
2. As they become hot,
what do they do?
3. What impact do these
hot particles have on the
neighbouring particles?
4. Which process is
happening in this image?
5. Define the process.
Gear 2 -
Independent
Work
Convection Seen
Watch the picture
on this slide, video on
the next slide and a
picture on slide 13.
Then develop your
summary on
convection as
required in slide 15.
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Convection explained
Convection
The rising and falling of liquids and
gases due to differences in density
(which are caused by differences in
temperature).
Convection
• What is it? Define
the word.
• Sketch a labelled
diagram to explain it
• Describe the process
using exercise on the
next slide
Gear 2 -
Independent
Work
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
REFLECTION QUESTIONS
Watch the image and
answer the questions in your
exercise books.
1. Which particles become
hot first?
2. As they become hot,
what do they do?
3. What do the cooler
particles do?
4. Which process is
happening in this image?
5. Define the process.
Gear 2 -
Independent
Work
Radiation Seen
Watch the picture on this
slide, video on the next slide
and pictures on slide 19.
Then develop your summary
on radiation as required in
slide 20.
Electromagnetic Spectrum
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Radiation explained
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Watch from: 4.00 min to the end
Radiation
All objects transfer energy to their
surroundings by infrared radiation. The
hotter an object is, the more infrared
radiation it gives off.
Radiation
• What is it? Define
the word.
• Sketch a labelled
diagram to explain
it
• Describe the
process.
HINT: Use
electromagnetic
spectrum and
Infra-red radiation
Gear 2 -
Independent
Work
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Measure your understanding!!
•
In your exercise book,
•
Radiation happens
•
Draw a metal pot on a flame, •
(show radiation by zigzag
•
Show some soup in it.
Give the pot a wooden handle.
•
•
Draw a hand holding the handle.
•
On the diagram, label
•
where:
•
•
Conduction happens
•
Convection happens
arrows)
•
•
•
Then,
Describe in terms of particles;
How conduction transfers thermal
energy
How convection transfers thermal
energy
How radiation transfers thermal
energy.
•
•
Analyse safety hazards in
this scenario.
For each hazard, state
precaution that you shall
take.
•
•
Why was the handle made of
wood?
Is it a good idea to make the
handle of metal?
Energy and Temperature
https://www.youtube.com/watch?v=LL54E5CzQ-A
What is temperature?
• We use thermometers to measure
temperature
• We measure temperature in degrees
Celsius (°C)
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Heat
• Is the amount of thermal
energy, measured in joules
(J).
• The amount of thermal
energy something has
depends on the kinetic
energy of its particles.
• The faster the particles
move, the more thermal
energy they have
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature.
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Heat flow
• Energy is always transferred from hot to cold
• Temperature difference is reduced until both
objects are the same temperature
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Heat vs Temperature
A cup of coffee 70°C
• The particles are at a very high temperature
• Each particle of solid is VIBRATING &
• Each particle of coffee is moving fast
• Because it is very hot, they are vibrating /
moving a lot
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Heat vs Temperature
A bath full of warm water 35°C
• The bath contains more particles than the cup
• Each particle of the water is moving less as it is
at a lower temperature
• BUT because there are so many - there is more
HEAT energy
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Material
• We perceive different materials to be
different temperature
• Our hands measure the transfer of energy,
not actual temperature
• Some materials conduct heat better than
other, so gain or lose energy more easily
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
• https://www.youtube.com/watch?v=vqDbMEdLiCs
Challenge Grid: Attempt the Grid Questions in
Exercise books
1. What do we use to
measure temperature?
4. Which direction is
thermal energy
transferred?
2. What are the units of
temperature?
5. Which has a larger
energy store,a
swimming pool at 20°C
or a beaker of water at
60°C? Why?
3. What are the units of
energy?
6. Draw particle
diagrams to show
particle arrangement in
solid, liquids and gases.
7. Why do some
materials feel colder
than others when both
are at room
temperature?
8. Explain what
happens to a solid as it
is heated using the
words: vibrate, energy
and
Which is hotter??
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Which is hotter??
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Which is hotter??
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Which is hotter??
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Which is hotter??
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Which is hotter??
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Which is hotter??
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Which is hotter??
By the end of this week, you
will:
•
Describe how energy is
transferred by
radiation, conduction
and convection.
•
Use the particle model
to explain energy
transfers in matter.
•
Compare heat and
temperature
•
Link evaporation to
heat energy transfer
and analyse how it
causes a cooling effect.
Bingo
In your books, draw out a grid like the one below.
Write a keyword in each box.
Thermometer
Joules
Temperature
Celsius
Vibrate
Kinetic energy
Thermal energy store
Colder
Equilibrium
Volume
Heat
Learning Check
 Back of your books
Is it conduction, convection or radiation?
Learning Check
1.
Learning Check
2.
Learning Check
3.
Learning Check
4.
Learning Check
5.
What is evaporation?
Consider the picture given and answer the following questions:
1. What is Evaporation?
Evaporation occurs when the energetic / hot particles in a liquid escape to form a vapour.
2. Does Evaporation happen at a particular temperature like boiling or it may
happen at any temperature?
Evaporation can happen at any temperature
3. At which temperature does Evaporation happen
the quickest?
Evaporation happens quickest at boiling point
4. What do particles that escape do?
The particles that escape take some energy from the
remaining particles, so the temperature of the liquid falls.
5. Can evaporation be a form of heat transfer?
Evaporation is another method of heat transfer.