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# Chapter 9 test

energy: the ability to do --- work
work is a --- of energy transfer
what is the difference between kinetic and potential energy? kinetic: energy of motion potential: energy because of position
what is the formula for kinetic energy? mv^2/2
what does the v in the formula for kinetic energy mean? speed
what is the formula for GPE? weight x height
what is the height in the formula for GPE? how far the object has to fall
does the height affect the amount of GPE? yes, it makes it greater
what is the total energy of motion and position in an object? mechanical energy
formula for mechanical energy: pontential energy + kinetic energy
can mechanical energy change? (increase or decrease) no
can potential and kinetic energy change? (increase or decrease) yes
thermal energy all of the kinetic energy due to random motion of the particles that make up an object
faster moving particles = --- kinetic and thermal energy greater
chemical energy energy of a compound that changes as its atoms are rearranged
food is made of --- compounds chemical
electrical energy energy of moving electrons
sound energy caused by objects vibrations
light energy produced by vibrations of electrically charged particles
nuclear energy energy that comes from changes in the nucleus of an atom
electrical energy is --- energy and sound energy is --- energy potential, kinetic
a change from one form of energy to another energy conversion
example of elastic potential energy rubber band
give an example of a conversion involving chemical energy photosynthesis
are energy conversions in everything we do? yes
--- help harness energy and make it work for you machines
a force that opposed motion between two surfaces thar are touching friction
in a --- system, energy is transferred only to each other closed
the total energy in a closed system --- stays the same
can energy change form one form to another? yes
why is prepetual motion impossible? a little bit of the energy is converted into thermal energy each time
comparison to the amount of energy before a conversion with the amount of useful energy after a conversion energy efficency
if something is more efficent, does it need more or less energy to operate? less
what are some examples of fossil fuels? coal, oil, petroleum
what are some examples of renewable resources? water, solar,wind, geothermal, biomass, nuclear
Created by: kfran0112