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P3: Conservation of Energy (Main sources of energy (Nuclear fuel, Bio-fuel…
P3: Conservation of Energy
Mass X Gravity X Height
Energy cannot be created or destroyed.
The pendulum shows the principle of conservation of energy in action. Gravitational potential energy is converted to kinetic energy and back, over and over again, as the pendulum swings.
Efficiency Formula
useful energy transferred by the device
—————————————————
total energy supplied to the device
Kinetic Energy
When work is done the energy is transferred from one type to another. This transferred energy may appear as kinetic energy.
MOVING OBJECT = Kinetic Energy = (Mass X Velocity)^2 X 0.5 (0.5 x mv^2)
Main sources of energy
Nuclear fuel
Bio-fuel
Fossil fuels
Wind
Hydroelecetricity
Tidal waves
The sun
2 ways of reducing unwanted energy transfer
Lubrication
Thermo-insulation
Gravitational Potential Energy = Mass X Gravity X Height
Gravity = 10