Without the ____ from the sun, life on Earth would not be possible
What is nuclear energy?
100
When one object does work on another, energy is
What is transferred?
100
The United States' primary source of electrical energy is generated by
What is burning fossil fuels?
100
Firewood is NOT a
What is fossil fuel?
200
Fossil fuels originally received their energy from the
What is Sun?
200
Machines can transfer energy and
What is convert energy?
200
If an object's mechanical energy remains constant and its kinetic energy increases, its
What is potential energy decreases?
200
An object that has kinetic energy must be
What is in motion?
200
Because work and energy are so closely related, they are both expressed in
What is Joules?
300
The particles in the ocean water has the MOST
What is thermal energy?
300
When rolling downhill, a roller coaster's potential energy is converted into
What is kinetic, thermal, and sound energy?
300
As a pendulum swings downward, its potential energy is
What is converted into kinetic energy?
300
A single uranium fuel pellet contains the energy equivalent of about one
What is metric ton of coal?
300
An object's mechanical energy is
What is the sum of its potential and kinetic energies?
400
You lifted a 50 N bowling ball 2 m above the floor, you performed work equal to
What is 100 J to lift the ball?
400
Plastics and synthetic fibers are produced from
What is Petroleum?
400
Food is digested and used to regulate body temperature, charcoal is burned in a barbecue pit, and coal is burned to boil water are examples of
What is conversion from chemical energy to thermal energy?
400
______ is stored in a stretched rubber band.
What is Potential energy?
400
Coal, petroleum, and natural gas are all examples of
What are fossil fuels, super-concentrated forms of the sun's energy, and nonrenewable resources?
500
Our most important energy resource is/are
What is the sun?
500
An electric generator is not
What is an energy resource?
500
If fuels are nonrenewable, why do we use them for energy?
What is they provide a large amount of thermal energy per unit of mass?
500
A comparison of the electrical energy going into a light bulb with the light energy coming out of it is a measure of its
What is energy efficiency?
500
Before a music box will play music, you must do work on the spring inside by winding it up. This work is stored as ______, giving the music box the ability to play music.