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physics number 2 ( the same but better )
energy
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Cards (98)
extension is
directly proportional
to force applied
there is a
limit
to
proportionality
where the
elastic
object wont return to its
original
shape
specific
heat capacity
is the amount of
energy
required to raise
1kg
of a substance by
1
degree
change in thermal energy =
mass
x
specific heat capacity
x
change in temperature
work done
=
force
x
distance
a
system
is a
group
of
objects
what is a system
a
group
of
objects
what is energy measured in
joules
(
J
)
food fuels and chemical cells store energy
chemically
hot objects store energy
thermally
moving objects store ------- energy
kinetic
objects that can elastically deform store ------- energy
elastic
objects that have been lifted up store -----------
gravitational potential energy
magnetic objects or objects that are in or near a magnetic field store -------- energy
magnetic
the nucleus of atoms and radioactive materials store ------ energy
nuclear
charged
objects store
electrostatic
energy
what are all the energy stores
chemical
,
thermal
,
kinetic
,
elastic
potential ,
gravitational
potential , ,
magnetic
,
nuclear
,
electrostatic
what are the four energy transfers
heating
,
mechanically
,
electrically
,
radiation
when a force moves an object
work
is
done
work done
=
force
x
distance
what is force measured in
newtons
what are the none renewable energy resources
crude oil
,
gas
,
coal
how do fossil fuels generate electricity
burn fuel
-
heat water
- turn
turbine
- turn
generator
-
what is a renewable energy resource
one that can be
replenished
as it is
used
what are the renewable energy resources
wind
,
solar
,
hydroelectric
,
tidal
,
biofuels
,
geothermal
,
wave power
advantages of renewable energy resources
will
never run out
don't add carbon dioxide to the atmosphere
disadvantages of renewable energy
not always
reliable
(
wind
and
solar
)
can destroy
habitats
(
hydroelectric
)
only suitable in certain
climates
a lot of energy is used in the UK for
transport
and most renewable energy resources generate
electricity
biofuels are
carbon
neutral
what is the problem with biofuels
if we use
land
to grow
crops
for
fuel
it could
increases
the
price
of
food
what does carbon neutral mean
achieving
net zero
carbon emissions by
balancing
the amount of
carbon released
with its
offset
kinetic energy
is the energy stored in moving objects
what is kinetic energy?
the
energy
stored in
moving objects
what energy is stored in moving objects?
kinetic
kinetic energy =
0.5
x
mass
(
kg
) x
speed
(
m/s
)
squared
kinetic energy = ...
0.5
x
mass
x
speed squared
elastic potential energy
is the energy stored in a stretched spring or elastic object
whats is elastic potential energy
the energy
stored
in a
stretched spring
or
elastic
object
when a spring reaches its
limit
of
proportionality
it wont go back to its
original
shape
what happens when i spring reaches its limit of proportionality
it doesnt return to its
original shape
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