Energy (P1, P2 and P3) Flashcards
what are the 7 stores of energy
thermal , nucluer , elastic , gravitational , kinetic , magntic , chemical
what is a system
an object or group of objects
what is the formula for gravitational energy
Ep = mass times gravity times height
what is the worlds gravitational pull
9.8
what is the formula for working out kineic energy
1/2 * mass * velocity squared
energy can be transferred but can not be
created or destroyed
what is wasted energy
energy that is not usefull eg. thermal energy in a lamp
how does temperature effect kinetic energy
increases it
what is the formula for elastic energy
1/2 * spring constant * extension squared
what is the symbol formula for kinetic energy
ek = 1/2 mv squared
what is the symbol formula for gravitational energy
ep = mgh
what is the symbol formula for elastic
ee= ke squared
t/f
t/f
in the kinetic energy formula what is kinetic energy measured in
joules ( j )
in the kinetic energy formula what is mass measured in
kilograms ( kg)
in the kinetic energy formula what is velocity measured in
meteres per second ( m/s)
in the elastic energy formula what is elastic energy measured in
joules ( j )
in the elastic energy formula what is spring constant measured in
newtons per meter ( n/m )
in the elastic energy formula what is extension measured in
merters (m)
in the gravitational energy formula what is gravitational potential energy measured in
joules ( j )
in the gravitational potential energy formula what is mass measured in
kilograms ( kg )
in the gravitational potential energy formula what is gravitational field strength measured in
newtons per kilogram ( N /kg )
in the gravitational potential energy formula what is height measured in
meters ( m )
what is the formula for the system change as the temperature increases
change in thermal energy = mass * specific heat capacity * temperature change
what is power
the rate at which work is done
what is the formula for power
power = work done / time
what is power measured in
watts
what is work done measured in
joules
what is time measure in
seconds
what is the formula for efficency
usefull output energy transfer / total input energy transfer
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how can we reduce wasted energy
lubrication , insulation
how does lubrication reduce wasted energy
reduces friction = reduces heat
