Utilisateur
joules
insulator
kinetic
efficiency
magnetic, kinetic, heat (thermal), light, gravitational potential, chemical, sound, electric, elastic, nuclear
the ability of doing work
work done= force x distance
solar power, wind power, hydroelectric power, tidal power, wave power, geothermal power, biofuels
kinetic energy= 1/2 x mass x (speed) squared
toy car travelling down a ramp, gas particles moving in the air, parachute falling through the air
fossil fuels, nuclear fuel
elastic potential energy= 1/2 x spring constant x (extension) squared
newtons per metre (n/M)
metres
stretched elastic band, tennis ball that has been squashed, extended spring
gravitational potential energy= mass x gravitational field strength x height
newtons per kilogram, N/kg
apple on a tree, plant pot on a windowsill, aeroplane in the sky
change in thermal energy= mass x specific heat capacity x temperature change
joules per kilogram per degree celsius, J /kg degrees C
the amount of energy needed to increase the temperature of a 1kg material by 1 degree celsius
chemical energy stores -> thermal energy stores, and light and sound carry energy to the surroundings
thermal energy stores of the surroundings
chemical energy stores -> kinetic energy stores
thermal energy stores and some is carried by sound waves to the surroundings
chemical energy stores -> thermal energy stores and light and sound waves carry the energy to the surroundings
thermal energy stores of the surroundings
as the ball moves upwards, the kinetic energy store of the ball decreases and the gravitational potential energy store of the ball increases
when the ball hits the wall, kinetic energy decreases and elastic potential energy increases. some of the energy is also transferred to the surroundings. the thermal energy of the surroundings increases and some of the energy is carried by sound waves
as the car moves, the chemical energy of the petrol decreases and the kinetic energy of the car increases. some of the energy is also transferred by sound waves to the surroundings and the thermal energy store of the surroundings also increases
a renewable energy resource can be replenished
a non- renewable energy resource will eventually run out
a force moves an object and energy is transferred
newtons
power= work done/ time taken
includes fuels, food or chemicals in batteries. the energy is transferred in chemical reactions
the energy an object has because it is moving
the energy stored in an object because of its position, such as an object above ground
the energy stored in a springy object when you squash it
the energy a substance has because of its temperature
the energy stored within a magnetic field
a form of kinetic energy that travels in waves and can be detected by the human eye
a form of mechanical energy that travels as sound waves, resulting from the vibrations of an object
the energy transferred when electrical charges move across a potential difference