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Conservation of Energy - Coggle Diagram
Conservation of Energy
Energy Changes
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Object projected upwards
KE transferred to GPE, then vice versa as it falls back down
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Conservation of Energy
In physics, conservation of energy means that the total energy of an isolated system remains constant
A ‘closed system’ has no external forces acting on it (e.g. no change in gravitational force, no electrostatic attraction, no external magnetic force etc.)
In a closed system, the total energy in the system never changes, regardless of the energy transfers that take place
In other words, in a closed system no energy is lost
Once it becomes an open system, energy can be transferred out of the system, and therefore the total energy of the system can change
Energy
Change in gravitational potential energy (joule, J) = mass (kilogram, kg) × gravitational field strength (newton per kilogram, N/kg) × change in vertical height (metre, m)
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Kinetic energy (joule, J) = ½ x mass (kilogram, kg) × (speed)2 (metre/second2 , m/s2 )
Energy Transfer
Diagrams show energy input, and the energy output
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Increasing Efficiency
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Recycling waste output and using it as input (absorbing heat energy dissipated and used to as input heat energy)
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Waste Energy
To reduce waste
Thermal insulation, so less heat is lost to surroundings
Lubricate systems, so less friction and less heat created
Buildings
Thicker walls mean greater thermal insulation, so less heat is lost
Air cavities between walls causes lots of heat loss by convection - cavity wall insulation fills in this gap and prevents air flow
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Use of Energy Resources
During industrial revolution, fossil fuels became an important source of energy as it was easy to mine, and provided a lot of energy
Only recently has renewable energy become more suitable – technology has had to develop a lot since industrial revolution to be able to harness such energy sources efficiently
Energy Sources
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Non-renewable energy is used more for large-scale energy supplies due to the large energy output per kilogram of fuel
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