P1: Conservation/dissipation of energy
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What are the energy stores
Kinetic Grav Potential Elastic Chemical Electrostatic Magnetic Light Internal
What are the energy transfers
Radiation Thermal Electrical Mechanical
What is the Conservation of Energy
Energy cannot be created or destroyed, we can only transfer
What is the equation for kinetic energy
0.5 x Mass x Velocity squared
What is the equation for grav potential energy
mass x height x grav field strength
What is the equation for elastic energy
0.5 x Spring constant x Extension squared
What is energy measured in
Joules
What is the equation for thermal energy
Mass x Specific heat capacity x Temperature Change
What is efficiency
How good a device is at transferring energy input to useful energy output
How do we work out efficiency
Useful energy output/Total energy input Multiply by 100 if you want a percentage
What is power
The rate of doing work
How do we work out power
Energy/Time
What is power measured in
Watts
What is time measured in
Seconds
What is mass measured in
Kilograms
What is velocity measured in
Metres per second m/s
What is height measured in
Metres
What is gravitational field strength measured in
N/Kg Newtons per kilogram
What is extension measured in
Metres
What is spring constant measured in
N/m Newtons per metre
What is temperature change measured in
Degrees Celsius
What is specific heat capacity measured in
J/Kg 0 C Joules per kilogram degrees Celsius