Energy- Energy Flashcards
10 stores of energy are c______, t______, k______, g____________ p_________, e_______ p_________, n______, s____, l____, e_______ and m________.
10 stores of energy are chemical, thermal, kinetic, gravitational potential, elastic potential, nuclear, sound, light, electric and magnetic.
The unit of energy is ______ (_)
The unit of energy is Joules (J)
Energy can be _________ from one form to another but can’t be _______ or _________ this is called conservation of energy.
Energy can be transferred from one form to another but can’t be created or destroyed this is called conservation of energy.
How do you calculate energy input?
Energy input= useful energy + wasted energy
______ energy is energy that is not in a useful format that is ___________.
Wasted energy is energy that is not in a useful format that is dissipating.
How do you calculate work done?
Work done = force applied x distance moved
How do you calculate efficiency?
Efficiency = useful energy transferred ÷ total energy supplied by the device
How do you calculate power?
Power = energy transferred to appliance ÷ time taken for the energy to be transferred
An energy transfer of 1 Joule per second is equal to a power of _ ____
An energy transfer of 1 Joule per second is equal to a power of 1 Watt
what is kinetic energy
energy stored in moving objects
what is the equation for kinetic energy
Ek= 0.5 x m x v^2
why type of energy is petrol
chemical energy
when we stretch a spring we are applying _____ to change the ______ of the spring.
this is what scientists call ‘doing ____’
when we stretch a spring we are applying force to change the length of the spring
this is what scientists call ‘doing work ‘
we are putting ______ in to stretch the spring. the stretched spring is storing this energy and we call that energy _______ _________ ______.
we are putting energy in to stretch the spring. the stretched spring is storing this energy and we call that energy elastic potential energy
if there is no force on the spring there is also no….?
no force = no extension
what is the symbol for extension
lower case (e)
true of false?
the extension is directly proportional to the force applied
true
if you were to plot this, you would get a straight line running through 0
what happens to the extension if you apply to greater force
the extension is no longer directly proportional to the force
the spring has been stretched beyond the limit of proportionality
what is the equation for elastic potential energy
Ee= 0.5 x k x e^2
in this equation what does the k stand for
the spring constant
in this equation what does the e stand for
the extension
what unit is the extension measured in
metres (m)
what is gravitational potential energy
the energy stored in an object due to its position above the earths surface
how do you calculate gravitational potential energy
Ep= m x g x h