AJD C:\...\Energy Darts Sheet
Y9 Energy
ENERGY DARTS SHEET-ANSWERS
Energy is measured in Joules. It cannot be created or destroyed, but just about
everything we do changes energy from one form to another.
This means that we cannot “use energy up”, it always has to go somewhere.
Energy is what makes things happen, and it takes many forms.
If an object is moving, we say that it has “kinetic” energy, and the faster it
goes, the more energy it has. Also, a car moving at 5 metres per second has
more energy than a brick moving at the same speed, because the car has a
larger mass.
If an object is in a high place we say that it has “potential” energy. The energy
comes from the work that we did against gravity in order to get it up there.
Light and Sound are also forms of energy.
Energy can be stored in several different ways. We can store mechanical
energy in a spring, and release it whenever we like. Fuels, such as the gas in
our labs, contain stored chemical energy, which we release when we burn the
gas. That energy originally came here as sunlight, which prehistoric plants
caught and stored. Millions of years later, we can release it to cook our food.
Heat is another type of energy. This is worth remembering, because most
processes produce waste heat. So when you’re asked “What has happened to
the wasted energy?” you can answer “It’s been changed into heat energy”.
Here are some energy chains:
An explosion:
heat
light
chemical energy
sound
kinetic energy of debris
A rock falling off a cliff into the sea:
potential energy
kinetic energy
These are the words you will need:
created
sunlight
release
mass
cannot
potential
Light
potential
faster
chemical
sound
heat
kinetic energy of "splash"
destroyed
heat_energy
kinetic
kinetic
gravity
AJD C:\...\Energy Darts Sheet
Y9 Energy
sound
heat
spring
AJD C:\...\Energy Darts Sheet
Y9 Energy
ENERGY DARTS SHEET
Energy is measured in Joules. It cannot be _______or _________, but just
about everything we do changes energy from one form to another.
This means that we ______ “use energy up”, it always has to go somewhere.
Energy is what makes things happen, and it takes many forms.
If an object is moving, we say that it has “_______” energy, and the ______ it
goes, the more energy it has. Also, a car moving at 5 metres per second has
more energy than a brick moving at the same speed, because the car has a
larger ____.
If an object is in a high place we say that it has “________” energy. The energy
comes from the work that we did against _______ in order to get it up there.
L____ and Sound are also forms of energy.
Energy can be stored in several different ways. We can store mechanical
energy in a ______, and release it whenever we like. Fuels, such as the gas in
our labs, contain stored ________ energy, which we release when we burn the
gas. That energy originally came here as ________, which prehistoric plants
caught and stored. Millions of years later, we can _______ it to cook our food.
Heat is another type of energy. This is worth remembering, because most
processes produce waste ____. So when you’re asked “What has happened to
the wasted energy?” you can answer “It’s been changed into ____________”.
Here are some energy chains:
An explosion:
heat
light
chemical energy
__________ energy of debris
A rock falling off a cliff into the sea:
_________ energy
kinetic energy
These are the words you will need:
created
sunlight
release
mass
cannot
potential
Light
potential
faster
chemical
sound
heat
kinetic energy of "splash"
destroyed
heat_energy
kinetic
kinetic
gravity
AJD C:\...\Energy Darts Sheet
Y9 Energy
sound
heat
spring