Download File

FORMS OF ENERGY

Open up and read through the Energy PowerPoint presentation (on
www.mizellis.com ).

Complete the following questions to show what you have learnt about energy.
1. Define energy:
The capacity to do work (cause a change on something else)
2. Wood and food are sources of energy but what is the ultimate source of energy?
The Sun
3. Use the table below to answer the following questions about energy.
(a)
What is the average energy gained from the food you eat in a day? 11000kJ
(b)
How many kilojoules of energy does a burning match produce?
(c)
Which has more energy stored in it, a car battery or 1 L of petrol? 1L petrol
(d)
Is there enough energy stored in a battery to boil a kettle of water? yes
10kJ

Watch the BrainPop “Forms of energy”

Answer the questions below to show your understanding of energy forms.
1.
Recall FOUR types of energy.
Electrical, gravitational potential, elastic potential, light
2.

Identify the type of energy:
(a) a person has when running.
kinetic
(b) a spring has when it is pulled.
Elastic potential
Complete the table below to identify ONE situation in which each form of energy is
evident.
Type of Energy
Situation in which this type of energy is
evident (ie. description and examples)
Energy of movement eg. Rolling a bowling ball
1. kinetic energy (KE)
3. gravitational potential energy (GPE)
 stored energy (energy in any object which
has the potential to do work)
NB: the next 3 types of energy are of this type
Energy of an object raised above surface of
Earth eg. rock on a cliff
4. elastic potential energy (EPE)
Energy of something stretched eg. stretched
elastic band
2. potential energy (PE)
Stored chemical energy eg. in an AA battery
5. chemical potential energy
6. nuclear energy
Energy stored in nucleus of atom eg. in
uranium fuel
Energy in a sound wave eg. from a speaker
7. sound energy
Thermal energy eg. from a fire
8. heat energy
Energy in moving photons eg. from a torch
9. light energy
10. electrical energy


Energy that is carried by moving charges.
stored in batteries as chemical PE.
CHAPTER 9
Core Science Stage 4: Unit 9.1
9.1
Types of energy
1. Types of energy and their sources
Complete the following table by identifying energy sources for each energy type listed.
Sources: fluorescent tube, uranium fission, chocolate bar, moving tennis ball,
vibrating violin string, rubber band, battery, infra-red lamp
Energy type
Source
Chemical potential
Battery, chocolate bar
Sound
Vibrating violin string
Light
Infra-red lamp, fluorescent tube
Electrical
Battery
Heat
Uranium fission, Infra-red lamp,
fluorescent tube, battery
Elastic potential
Vibrating violin string, rubber band
Nuclear
Uranium fission
Kinetic
Moving tennis ball, vibrating violin
string, rubber band
2. Types of potential energy
Potential energy can be classified as: gravitational PE, elastic PE, chemical PE.
Classify each of the following examples into each category of potential energy.
Category of potential energy
Example
Air brakes in a truck
Elastic
Wound watch spring
Elastic
Kerosene
Chemical
Sugar
Chemical
Depressed trampoline canvas
Elastic
Comet
Gravitational
Parachutist at the point of launch
Gravitational
3. Energy transformation
Describe the energy transformation illustrated.
Elastic potential energy  kinetic energy
ENERGY TRANSFERS and CHANGES
(TRANFORMATIONS)

Watch the BrainPop “Kinetic Energy” and then “Potential Energy”

Open up and read through the Energy Transfers (Changes) and Transformations
PowerPoint presentation (on www.mizellis.com )

Answer the questions to show your understanding of energy change.
3.
Use a suitable example to describe what is meant by:
(a) an energy transfer
Energy being passed from one object to another, for example heat energy being
transferred from a fire to water in a billy.
(b) an energy transformation
Energy being changed from one form to another, for example electrical energy being
changed to heat and light energy in a torch.
4.
Outline the Law of Conservation of Energy.
Energy can be neither created nor destroyed, it can only be changed from one form
to another.
5.
Outline the different kinds of energy involved in a trampoline jump.
Chemical energy in the body being converted to kinetic energy of body. The
stretched trampoline has elastic potential energy which is converted to kinetic energy of
the person who gains gravitational potential energy in any upwards movement.
6.
Imagine riding your bike along a flat gravel road. If you brake suddenly, the bike
eventually stops. It no longer has kinetic energy. However, the energy is not lost.
Describe what happens to the kinetic energy.
Due to friction of the brakes with the tyre and also the wheels with the road, the
kinetic energy is converted to heat and a little bit of sound energy.
Complete the table below.
7.
ENERGY USED
ENERGY CONVERTER
ENERGY PRODUCED
Electrical
light globe
Heat, light
Electrical
electric fan
Mechanical/kinetic/sound
Chemical PE
petrol engine
Sound, heat, kinetic
kinetic
turbine
electric
Chemical PE
torch cell
electrical
Chemical PE
steam engine
Heat, sound, kinetic
Nuclear PE
atomic bomb
Heat, sound, kinetic
electrical
Heating element
heat
Elastic PE
catapult
kinetic
Gravitational PE
waterwheel
Mechanical/kinetic
kinetic
instrument
sound
Consider a solar-powered car.
(a) What is the source of energy for a solar-powered car?
Sunlight
(b) What energy conversion occurs when the car is moving?
Solar energy  electrical energy  kinetic energy
(c) How would such car operate at night or on cloudy days?
It couldn’t unless it was able to have a source of stored energy or if a UV lamp was
shone on the panels.