Physics: Energy Flashcards
Name all 8 energy stores
Thermal, Kinetic, Gravitational Potential, Elastic Potential, Chemical, Magnetic, Electrostatic, Nuclear
How can energy be transferred
mechanically (force doing work), electrically, heating, radiation
What is the Kinetic energy formula
0.5 x m (mass/kg) x v2 (velocity squared m/s2)
What is the Gravitational Potential energy formula
m (mass/kg) x g (gravitational field, N/kg) x h (height/m)
What is the Elastic Potential energy formula
0.5 x k (spring constant, N/m) x e2 (extension squared/m)
What is Specific Heat capacity
The amount of energy required to increase the temperature of 1kg of a substance by 1C
What is the formula related to specific heat capacity
(delta)E (change in energy) = m (mass/kg) x c (Specific Heat capacity, J/kgC) x (delta feta) (temperature change C)
What is the conservation of energy principle
Energy can be transferred, stored or dissipated but can never be created or destroyed
What is Power
rate of energy transfer/rate of doing work
What are the two formulas for power
P=E(energy transferred) / t(time)
P=W(Work done) / t(time)
What is Conduction
Process where vibrating particles transfer energy to neighbouring particles
Where can Conduction happen
Solids
What is Convection
Process where energetic particles move away from hotter to cooler regions
Where can Convection happen
Gases and Liquids
What two methods can you use to reduce the amount of waste energy
Lubrication and Insulation
