Energy Quiz Flashcards
why was energy difficult to describe
because it involves only an abstract idea, not a material object
what is chemical energy
potential energy stored in the chemical bonds of compounds
how is chemical energy released
through the breaking of chemical bonds
what is energy
the ability to do work
what is energy the same as
work
what is electrical energy
work done by moving charges
how was electrical energy discovered
when a magnet was moved through a could wire and it was observed that this caused an electrical current to flow through the wire
what is nuclear energy
the potential energy stored in a nucleus of an atom
how is nuclear energy released
when the nucleus of an atom is split or when the nuclei of two atoms combine
how does solar energy result
from a hydrogen-hydrogen nuclear fusion reaction with the release of nuclear energy within the sun
how does radiant energy from the sun travel to the earth
as electromagnetic radiation
whats motion energy called
kinetic energy
what are the two types of energy that can be observed in nature
kinetic energy and gravitational potential energy
why can kinetic energy be observed in nature
because any object in motion can be made to do work
why can gravitational potential energy be observed in nature
because any object raised above earth’s surface has the potential to do work because of is position
what is the sum of motion and position energy known as
mechanical energy
what is heat
the transfer of thermal energy from a hot object to a cold object
what is potential energy
the energy that is stored or held in readiness
what is weight
measure of the force of gravitational attraction on an object
why does the mass of an object never change
because the amount of matter the object possesses is constant
what does the weight of an object depend on
the acceleration due to gravity
what happens if a force is used to stretch an elastic
the force acts against the elastic force of the material resulting in a change in shape
whats elastic potential energy
energy stored in elastic materials as a result of their stretching or compression
what is elastic potential energy an example of
work being done by applying a force through a distance gainst an opposing force which results in an energy transfer to the object and the energy being stored in the object as potential energy
when is potential energy useful
when it is converted into some other form of energy
what is chemical potential energy
the energy found in chemicals
whats kinetic energy
energy associated with the motion of an object
whats mechanical energy
energy due to the motion and the position of an object
what does the law of conservation of energy
that the total amount of energy in a given situation remains constant
what does the law of conservation of energy show
that energy can be converted from one form to another, but the total amount of energy never changes
what are the 3 pieces of evidence that an energy conversion has occurred
motion, change in shape, change in temperature
how do hydroelectric dams work
they convert the energy from moving water into electricity
how does a coal-burning power station work
converts the chemical potential energy in the coal to heat, which turns water into steam that turns a turbine to produce electricity
how does nuclear energy work
uranium disintegrates during nuclear fission in the reactor which releases energy as radiation, which heats water into steam that turns a turbine to produce electricity
how does solar energy work
electrons are bound up in silicon crystals that get energy to break free when hit by sunlight, creating current
how does a hydrogen fuel cell operate
like a battery
how does a hydrogen fuel cell work
it converts the chemical energy in a fuel into electrical energy, creating by-products of heat and water
