Chapter 1 Flashcards
“The ability to do work”
energy
is the power that drives everything around us. It’s what makes it possible for us to move, grow, and stay warm, and it powers all the devices and machines we use every day.
energy
T OR F
Energy comes from many different sources, such as the sun, which provides sunlight and warmth, the food we eat, which gives our bodies the fuel to function, and fuels like gasoline, which powers cars and other machines.
T
T OR F
Energy isn’t just one thing—it can take many forms
T
T OR F
Energy can take only one form
F
Even when energy changes from one form to another, the _____________ stays the same; it just gets used in different ways.
total amount of energy
is stored energy and the energy of position
potential energy
is energy stored in the bonds of atoms and molecules. It is the energy that holds these particles together.
chemical energy
is energy stored in objects by the application of a force. Compressed springs and stretched rubber bands are examples of elastic energy.
elastic energy
is energy stored in the nucleus of an atom-the energy that binds the nucleus together. The energy can be released when the nuclei are combined or split apart.
nuclear energy
Nuclear power plants split the nuclei of uranium atoms in a process called ____________.
fission
The sun combines the nuclei of hydrogen atoms into helium atoms in a process called ___________.
fusion
In both fission and fusion, mass is converted into energy, according to __________________
Einstein’s Theory, E = mc2.
is the energy of position or place.
gravitational potential energy
Hydropower, such as water in a reservoir behind a dam, is an example of _________________________
gravitational potential energy.
is motion-the motion of waves, electrons, atoms, molecules, substances, and objects.
Kinetic energy
Electrical energy is the movement of electrons.
Electrical energy
Everything is made of tiny particles called ______.
atoms
. Atoms are made of even smaller particles called _, __, and ____
electrons, protons, and neutrons.
Electrons moving through a wire are called ___.
electricity
is electromagnetic energy that travels in transverse waves.
radiant energy
is the internal energy in substances— the vibration and movement of atoms and molecules within substances.
thermal energy (heat)
is the movement of objects and substances from one place to another.
Motion energy or mechanical energy
y is the movement of energy through substances in longitudinal (compression/rarefaction) waves.
Sound energy
is produced when a force causes an object or substance to vibrate.
sound
some of the energy sources can be replenished in a short period of time. Such energy sources are referred to as ____________
renewable energy sources
the energy sources that we are using up and cannot be generated in a short period of time are called
non-renewable energy sources
these sources include include coal, petroleum, natural gas, propane, and uranium.
Nonrenewable energy sources
They are used to generate electricity, to heat our homes, to move our cars, and to manufacture products from candy bars to cell phones.
Nonrenewable energy sources
Since the beginning of mankind, we have been using _____________ to generate heat, light and electricity for various purposes.
fossil fuels
These are the primary sources for generating electrical energy in the world today.
fossil fuels
______________, such as coal, oil and natural gas, are important non-renewable sources of energy.
fossil fuels
Over __% of our energy demands are met by the combustion of fossil fuels.
85
is the main constituent of these fossil fuels
carbon