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TOPIC 6 – TRANSFERRING ENERGY
Name:_____________
1. What is an energy source?
- An object or material that can transfer energy to other
objects.
- Ex. Light bulb, fire
2. We will investigate the 3 types of energy transfer –
radiation, conduction and convection.
3. Does energy occupy space?
- NO; it does not occupy space, it cannot be weighed, it is not a
substance.
- Energy IS a property or quality of a substance and can be
transformed from one type to another/passed from one
object to another.
4. What is Radiation?
- The transfer of energy without any movement of matter
- Ex. Sun warming up objects; radio waves
5. Energy is transferred by radiant energy or electromagnetic
radiation.
6. What is EMR?
- Electromagnetic radiation
7. How does EMR travel and what can it go through?
- EMR travels/behaves like a wave
- EMR can travel through empty space, as well as air, glass,
water and many other materials
8. What are the five forms of EMR? P.226
1. Radio Waves
2. Microwaves
3. Visible Light
4. X-rays
5. Infrared Radiation (Heat Radiation)
9. All different forms of radiant energy share several
characteristics: They behave like waves, they can be absorbed
and reflected by objects and they can travel across empty
space at the speed of 300,000 km/s. p.226
10. What is Conduction?
- The process of transferring thermal energy through direct
collisions between particles
11. Use the particle theory to explain how thermal conduction
works when you place a metal spoon into a bowl of HOT soup.
P.229
- Particles touching the soup (heat source) absorb energy and
begin moving faster
- The fast-moving particles bump into neighboring particles,
increasing their energy and motion
- Eventually, thermal energy is transferred throughout the
spoon
12. Poor conductors are called heat insulators. Explain why.
Give an example of each. P.229
- Insulators slow down the heat transfer from the object
to the surroundings
- Ex. Glass, wood, plastic, Styrofoam
13. What is Convection?
- A process by which a warm fluid (liquid or gas) moves
from place to place carrying thermal energy in a
convection current (continuous circulation of a fluid)
14. A hot fluid can force its way through a colder fluid. In
convection the warmer fluid moves from place to place,
carrying thermal energy.
15. Draw the label the convection current on p. 230.
Color Warm Air – Red
Color Cool Air - Blue
A. Warmed air expands.
B. Less dense,
warmer air rises.
C. The rising air cools and contracts.
D. The cool,
denser air sinks.
E. The cool air moves in to replace the rising warm air.
16. Using the particle theory, explain how convection currents
work.
- Particles move faster and spread out when they are
heated.
- As particles are heated, they become less dense and rise
- The rising particles cool, and contract (come closer together,
slow down) and sink
- The cool air moves in to replace the rising warm air
17. What is energy transfer? P.232
- Movement of energy from the source to another object or
from object to object resulting in a temperature increase,
particle movement, or sound waves
18. There are 5 Steps in an Energy Transfer System – p. 232
Please define or give examples of each from the text.
1. Energy Source – supplies energy to the rest of the system
Ex. Mechanical, chemical, nuclear, electrical
2. Direction of Energy – always away from the energy source
Ex. Carrie’s hand to the ball
3. Transformations – change in energy form as it moves
from object to object
Ex. Energy from Carrie’s fist was transferred to the volleyball
(kinetic), then to the floor (thermal/sound)
4. Waste Heat – in an energy transfer, at least some of the
energy is lost as heat (thermal energy)
Ex. Carrie’s hand warmed up, as did the floor
5. Control System – a way of keeping temperature constant
(ex. Thermostat for a furnace)
19. What is an RSI Value? P. 235
- Rating materials by their resistance of a 1cm thick piece to
heat conduction.
- higher RSI values mean the material is a better insulator
*Please complete Topic 6 Review p. 236 #1-3
*Please complete Topic 4-6 Review p. 237 # 1