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energy stores (efficiency (how good a machine is at transferring energy…
energy stores
efficiency
how good a machine is at transferring energy into useful energy
Input energy = useful + wasted
output divided by the imput
output = how much has been transferred to a useful store
kinetic energy
energy stored by movement
anything that is moving has energy in it's kinetic energy store
1/2 x mass x velocity (squared)
elastic potential energy
energy stored when a spring is squished or stretched
when a spring is stretched or squashed
1/2 x extension x spring constant (squared)
work done
is the energy transferred
still measured in joules
force applied x distance moved
gravitational potential energy
energy stored depending on its location
anything that has been lifted in a gravitational field
mass x 9.8 x height
power
Power is the rate of which work is done/energy transferred
one watt = 1 joule of energy every second
energy transferred ÷ time
nuclear
energy stored in a atoms nucleus
chemical
energy stored in the bonds of chemical compounds
electrical
energy stored in a circuit
thermal energy
energy stored by heat