3. Conservation of energy Flashcards
(21 cards)
Chemical energy
Energy stored in food, fuels and batteries, e.g. Engine
Kinetic energy
Energy stored in moving objects, e.g. A car
Thermal energy
Hot objects
Elastic potential energy
Stretched, squashed or twisted materials, e.g. Spring
Gravitational potential energy
Objects in high positions, e.g. A ball
Nuclear energy
Energy stored inside atoms
Law of conservation energy
Energy cannot be created or destroyed, only transferred from one store to another
Energy measurement units
Joules ( J )
Efficiency =
Useful energy transferred by the device/Total energy supplied to the device
Conducts
Thermal energy CAN be transferred through the material
Insulates
Thermal energy CAN’T be transferred through the material
Transfers
Energy moving from one store to another
Absorb
Take in
Emit
Giving out
Metals are good…
thermal conductors
Wood are poor…
thermal conductors
Gravitational Field Strength is…
10N/kg on earth
EQUATION: (J) = 0.5 x (kg) x (m/s)2
K.E = 0.5 x mv2
EQUATION: (J) = (kg) x (N/kg) x (m)
G.P.E = mgh
Non-renewable resources
Fossil fuels, e.g. oil, coal & natural gas
Renewable resources
Solar & wind energy
