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11
An object's ________ means how fast it's moving.
a) table
b) speedometer
c) speed
d) position
c) speed
11
________ is converted to heat energy whenever you burn something.
a) chemical potential energy
b) sound energy
c) light energy
d) gravitational potential energy
a) chemical potential energy
11
________ is what powers computers and televisions.
a) contact force
b) frictional force
c) muscular force
d) electric force
electric
11
________ is what we exert using our arms and legs.
a) magnetic force
b) frictional force
c) non-contact force
d) muscular force
d) muscular force
11
Nuclear power makes electricity using ________.
a) hydroelectric energy
b) geothermal energy
c) solar panels
d) atoms
d) atoms
11
________ pulls some metals together or pushes them apart.
a) muscular force
b) contact force
c) magnetic force
d) non-contact force
c) magnetic force
11
To save energy is to ________.
a) renewable
b) fossil fuels
c) conserve
d) dam
c) conserve
11
The higher you climb up a mountain, the more ________ you have.
a) elastic potential energy
b) gravitational potential energy
c) sound energy
d) chemical potential energy
b) gravitational potential energy
11
Plants eat ________, among other things. It provides most of the energy that all living things use.
a) elastic potential energy
b) light energy
c) chemical potential energy
d) heat energy
b) light energy
11
________ is less efficient than other renewable energies because it depends on the weather.
a) wind energy
b) gravitational potential energy
c) hydroelectric energy
d) fossil fuels
a) wind energy
11
________ is what comes out of your headphones when you listen to music.
a) sound energy
b) gravitational potential energy
c) conversion
d) electrical energy
a) sound energy
11
Melted rock under the ground, or '________' is hot enough to boil water.
a) geothermal energy
b) magma
c) solar panels
d) biofuel
b) magma
11
________ tells whether an object is moving north, south, up, down, back...
a) spring balance
b) speed
c) table
d) direction
d) direction
11
Would exerting a strong force or a weak force make an object move faster?
A strong force would make the object move faster.
11
________ is made from trash.
a) solar energy
b) biofuel
c) renewable
d) nuclear energy
b) biofuel
12
Energies that are not renewable can be called '________.'
a) nuclear energy
b) hydroelectric energy
c) limited
d) solar cells
c) limited
12
This is an example of a ________.
a) ruler
b) spring balance
c) distance-time graph
d) table
distance-time graph
12
________ is when one form of energy is changed into another.
a) chemical potential energy
b) kinetic energy
c) heat energy
d) conversion
d) conversion
12
Name two contact forces.
Muscular and frictional forces require contact.
12
What is an alloy?
An alloy is a metal made from other metals mixed together.
12
________ is exerted when two things rub together.
a) frictional force
b) electric force
c) gravitational force
d) contact force
a) frictional force
12
Solar panels have________ that convert light energy to electrical energy.
a) solar energy
b) turbines
c) solar cells
d) Newtons
c) solar cells
12
An object's ________ tells where it is.
a) graph
b) position
c) ruler
d) direction
b) position
12
When you stretch a rubber band, it stores ________.
a) heat energy
b) kinetic energy
c) elastic potential energy
d) conversion
elastic potential energy
12
Describe two ways we can conserve energy.
For example, we can turn off the lights when we leave a room and walk or ride a bike instead of driving.
12
________ pulls us toward large objects like the Earth and sun.
a) non-contact force
b) gravitational force
c) frictional force
d) electric force
b) gravitational force
12
Do round or flat objects move faster? Why?
Round objects move faster because they can roll.
12
When an object moves, you can say it is in ________.
a) motion
b) position
c) spring balance
d) measuring tape
a) motion
12
Q:Why can't this boy see what's on the other side of the pipe?
A: Light can only travel in ________ lines.
Light can only travel in straight lines.
12
A vehicle's ________ is used to measure speed.
a) position
b) ruler
c) graph
d) speedometer
d) speedometer
13
Most energy production requires steam to spin a(n) ________.
a) solar panel
b) fossil fuels
c) conserve
d) turbine
d) turbine
13
A(n) ________ is a unit of force.
a) graph
b) Newton
c) ruler
d) direction
b) Newton
13
A(n) ________ of water stores gravitational potential energy.
a) fossil fuels
b) limited
c) turbine
d) reservoir
d) reservoir
13
Do smooth or rough surfaces reflect light more clearly? Give an example.
Smooth surfaces reflect light more clearly. For example, a mirror reflects images almost perfectly, while a rough sidewalk does not.
13
Describe how a geothermal energy station works.
Heat energy from magma in the Earth boils water into steam, converting it to kinetic energy. It moves a turbine, which generates electricity.
13
What is the difference between weight and mass?
Weight depends on gravity. Mass is always there.
13
There is a type of exercise bicycle in airports that lets you charge your phone by pedaling. How does that energy conversion work?
________ -> _________ -> __________
chemical potential energy -> kinetic energy -> electrical energy
13
Which form of electrical production does NOT require a turbine?
a) hydroelectric energy
b) solar energy
c) nuclear energy
d) biofuels
b) solar energy
13
Electrical force comes from ________ called electrons.
a) a magnetic force
b) a non-contact force
c) atoms
d) particles
d) particles
13
What does 'exert' mean?
It means to make a force-- to push or pull.
13
What energy conversion does this toy airplane perform?
________ -> ________
elastic potential energy ->kinetic energy
13
When two facing ________ are the same, they create a force of repulsion.
a) poles
b) charges
c) particles
d) muscular forces
a) poles
13
A ________ holds back the water that make hydroelectric energy.
a) dam
b) renewable
c) wind energy
d) geyser
a) dam
13
What is the most efficient (best) way to produce electricity? Why don't we use it all the time?
Burning fossil fuels is the most efficient way to produce electricity. However, fossil fuels are a limited resource. Someday they will run out.
13
Protons have a positive ________, while electrons have a negative one.
a) magnetic force
b) charge
c) electric force
d) particle
charge
14
What energy conversion do we perform when we burn a candle?
________ -> ________ AND ________
Chemical potential energy -> light energy ANDheat energy
14
Describe how a hydroelectric power station works.
A dam blocks the water in a reservoir so that it stores gravitational potential energy. When the reservoir opens, the gravitational energy is converted into kinetic energy. It moves a turbine, which generates electricity.
14
Would it be easier to move a piano upstairs by lifting and carrying it or by pushing it up a ramp? Why?
The ramp would be easier, because there is less opposing gravitational force.
14
All machines accidentally create a little ________.
a) kinetic energy
b) electrical energy
c) heat energy
d) conversion
c) heat energy
14
How are shadows formed?
When an opaque object stands in front of a light source, the light cannot pass through it.
14
What type of energy conversion does this girl perform when she pedals her bicycle?
________ -> ________
chemical potential energy -> kinetic energy
14
Describe how a nuclear power plant works.
Heat energy from broken atoms boils water into steam, converting it to kinetic energy. It moves a turbine, which generates electricity.
14
Describe how a windmill works.
Wind provides kinetic energy to spin a turbine (the windmill), which generates electrical energy.
14
A centimeter is a(n) ________ of distance.
a) measuring tape
b) ruler
c) position
d) unit
d) unit
14
What do these words mean?
Translucent, Opaque, Transparent
'Transparent' means you can see through it clearly.
'Translucent' means you can only see through it a little bit.
'Opaque' means you can't see through it at all.
14
Describe how a traditional power station works using fossil fuels.
Heat energy from burning fossil fuels boils water into steam, converting it to kinetic energy. It moves a turbine, which generates electricity.
14
How does a solar cooker work?
It reflects sunlight onto some food, making the food hotter.
14
How far does Zoe travel between 10 and 20 seconds?
She travels 30 meters.
14
Name three fossil fuels that we use every day.
We use coal, natural gas, and petrol (gasoline).
14
Mars is smaller than Earth. If I go to Mars, will my weight be the same, heavier, or lighter than on Earth? Why?
My weight will be lighter, because a smaller planet exerts less gravitational force.
15
The boy eats a big lunch before practicing the flute. What energy conversion does his body perform when he blows it?
________ -> ________ -> ________
chemical potential energy -> kinetic energy -> sound energy
15
What type of energy conversion does this TV perform when you plug it into the wall?
________ -> ________ AND ________
electrical energy -> light energy AND sound energy
15
How do indoor skydivers fly?
A huge fan makes kinetic force to push against their gravitational force.
15
The ________ of this table's time axis is five seconds.
a) scale
b) ruler
c) graph
d) speedometer
a) scale
15
Which of these metals is magnetic?
a) steel
b) copper
c) aluminium
d) gold
a) steel
15
What is the name of the machine at the hospital that uses magnetic force to scan your body?
It's called an MRI machine.
15
This woman is underwater, in a submarine. What is the machine called that lets her see above the water? How does it work?
It's called a periscope. It uses mirrors to reflect light from above the water into the submarine.
15
In the middle picture, what form of energy is making Joe fly through the air? What kind of energy is he storing as he goes?
Kinetic energy is moving him through the air as he stores gravitational potential energy.
15
A(n) ________ is used to measure force.
a) speed
b) table
c) spring balance
d) measuring tape
c) spring balance
15
How long would it take Zoe to travel 120 meters?
It would take 40 seconds.
15
How do fiber optic cables work?
They reflect beams of light through a long tube of mirrors to communicate information.
15
Explain how a maglev train works.
Magnets with like poles keep the train floating, while magnets with opposite poles move it forward.
15
________ is a measurement of gravitational force.
a) mass
b) weight
c) a Newton
d) gravity
b) weight
15
What type of energy conversion does this battery perform when you put it in a toy robot to make the robot's eyes turn blue?
________ -> ________ -> ________
chemical potential energy -> electrical energy -> light energy
15
What force allows a card reader to read your card?
This machine uses magnetic force to read the magnets on your card.