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Energy and Work Done (energy (forms of energy (potential energy…
Energy and Work Done
energy
cannot be created or destroyed
energy-conserved
convert between forms
e.g firing a bow
photosynthesis
forms of energy
potential energy
chemical
gravitational
gravitational potential energy= mass * gravity * height
elastic
heat
light
sound
kinetic
kinetic
electrical
scalar quantity
equations
power=work done/time taken
useful power=force *speed
efficiency=useful work done/total energy
work done
force*distance moved
so object has to have been moved
joule = 1 newton * 1 metre
1N moves 1 kg object 1m/s^2 acceleration
sources of energy
renewable
wind
wind turbines
solar
photovoltaic cells
geothermal
power station
derived from hot rocks and volcanic areas
hydroelectric
dams
biofuels
e.g ethanol
produce carbon dioxide
sustained/renewed forever
eventually converted to kinetic or electrical
non-renewable
fossil fuels
e.g coal, oil
bad for environment
global warming
limited and will run out
energy has the ability to do work
SI unit: joule