During ____________, plants use light energy to produce new substances with chemical energy.
What is photosynthesis?
100
Gravitational potential energy depends on weight and ______
What is height?
100
An object's ___________ energy is the sum of its potential and kinetic energies.
What is mechanical energy?
100
An object that has _______ energy must be in motion.
What is kinetic?
200
Without the __________ energy from the sun, life on Earth would not be possible. It is our most important energy resource.
What is nuclear energy?
200
The kinetic energy of an object can be found if the object's ___ are known.
What is speed and mass?
200
When you turn on a light bulb, you convert _________ energy into __________ energy and _______ energy.
What is electrical, light and thermal energy?
200
______ energy is stored in a stretched rubber band.
What is potential energy?
200
Because work and energy are so closely related, they are both expressed in ________.
What is joules?
300
What is the gravitational potential energy of a 540 N diver standing on a platform 3 m high?
What is 1620 J?
300
When one object does work on another object, energy is ________.
What is transferred?
300
The energy used to cook food in a microwave is a form of ___________.
What is light energy?
300
The cleanest burning fossil fuel is ___. It is formed much the same way as petroleum.
What is natural gas?
300
As a pendulum swings ______ its potential energy is converted into kinetic energy.
What is downward?
400
The energy source powering the geyser "Old Faithful" in Yellowstone National Park is __________ energy.
What is geothermal?
400
Plants, wood, and waste are all examples of ________.
What is biomass?
400
They provide a large amount of thermal energy per unit of mass.
What is fossil fuels?
400
Fossil fuels originally get their energy from _________.
What is the sun?
400
Coal, petroleum, and natural gas are all examples of __________ resources, also called _________ fuels, which are super-concentrated forms of the sun's energy.
What is nonrenewable and fossil fuels?
500
Coal is formed from the remains of _________ while petroleum is formed from the remains of ____________.
What is plants and organisms?
500
The United States' primary source of electrical energy is generated by burning _________ _______.
What are fossil fuels?
500
The fossil fuel that creates the most fuel emissions and is used by U.S. power plants to run generators.
What is coal?
500
At what point does a roller coaster have the greatest kinetic energy?
What is "the bottom of the biggest hill"?
500
Plastics and synthetic fibers are produced from _________.