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60 Cards in this Set

  • Front
  • Back
ability to do work
energy
work is a transfer of
energy
work and energy is measured in
joules
energy of motion
kinetic
the kinetic energy if any moving object depends upon
its mass and speed
formula for kinetic energy
KE=1/2mv(squared)
energy that is stored as a result of position or shape
potential energy
potential energy taht depends upon its heigh
gravitational potential energy
an object's gravitational potential energy depends on
mass, height and the acceleration due to gravity
potential energy formula
pe=mgh
potential energy of an object that is stretched or compressed
elastic
the major forms of energy are
mechanical, thermal, chemical, electrical, electromagnetic, and nuclear
sum of an object's potential and kinetic energy
mechanical energy
energy associated with the motion and position of everyday objects
mechanical
total potential and kinetic energy of the microscopic particles
thermal
energy stored in the chemical bonds in compounds
chemical
energy associated with electric charges
electrical
form of energy that traveles through space in the form of waves
electromagnetic
energy stored in atomic nuclei
nuclear
chinese discover a new star
1054
greatest concentration of energy in universe
supernova
conservatoin of energy is the
underlaying law of the universe
energy cannot
be created or destroyed
process that releases energy by splitting nuclei
nuclear fission
releases energy when less massive nuclei combine to form a more massive nucleus
nuclear fusion
conservation of mechanical energy
(KE+PE)beginning= (KE+PE)=end
einstein's equations says that
energy and mass are equal and can be converted into eachother
energy is released as
matter is destroyed
matter can be
created from energy
speed of light
3.0 X 10 ^8
in nuclear fission and fusion large amounts of energy
are released by the destruction of very small amounts of matter
mass and energy together
are always conserved
exist in limited quantities and once used cannot be replaced except over a course of millions of years
nonrenewable energy resources
nonrenewable energy resources include
oil, natural gas, coal and uranium
oil, natural gas, ands coal because they were formed underground from the remains of once living organisms
fossil feuls
canbe replaced in a relatively short period of time
renewable energy resources
renewable energy resources include
hydroelectric, solar, geothermal, wind, biomass and possibly in the future nuclear fusion
energy obtained from flowing water
hydroelectric
sunlight that's converted into usable energy
solar
solar cells
photovoltaic
heat beneath earth's surface
geothermal
maximum kinetic energyis when
you go the fastest
chemical energy stored in living things
biomass
converted directly into thermal energy
biomass
generates electricity by reacting hydrogen with oxygen
hydrogen fuel cell
energy resources can be conserved by
reducing energy needs and by increasing hte effieciency of energy use
finding ways to use less energy or to use energy more efficiently
energy conservation
energy can be converted from
one form to another
process of changing energy from one form to another
energy conversion
the law of conservation of energy states that
energy cannot be created or destroyed
the gravitational potential energy of an object is
converted to the kinetic energy of motion as the object falls
weight swinging back and forth from a strign
pendulum
kinetic and potential energy undergo constant conversion as
the pendulum swings
when friction can be ignored
an object's mechanical energy doesn't change
mechanical
ME=PE+KE
total energy remains
unchanged even though many conversions can occur
i gram of TNT
2931 J
the square root of velocity equals 2(KE)/ m
velocity
e
energy
m
mass