Section 2 Energy And Pressure Flashcards
Principle of conservation of energy
Can be stored, transferred from one store to another or dissipated but it can never be destroyed
4 ways of energy transfer
Mechanically - work is done by a force pulling on an object like pushing pulling stretching
Electrically - by electric current flowing
By waves - by waves like light and electromagnetic and sound
By heating - energy being transferred from hotter objects to a colder object
Name all Energy stores
Kinetic
Gpe
Chemical
Elastic
Nuclear
Electrostatic
Thermal
Kinetic energy formula
Kinetic energy = 1/2 mass x speed(2)
Units for kinetic energy
M/s2
Change in GPe equation
GPe = mass x gravity x change in height
Falling objects equation
GPe lost = kinetic energy gained
Mechanical work done equation
Force x distance moved
Power equation
Energy transferred/ time taken
Efficiency equation
Useful/total
Change in pressure in liquid
Density x gravity x change in depth
Name 2 variables that affect the pressure at a point beneath the surface of a liquid
The pressure beneath the surface and the density of liquid
Non renewable energy resources
Coal
Oil
Natural gas
Renewable energy resources
The sun
Wind
Water waves
Hydroelectricity
Biofuels
Tides
Geothermal
What happens when a liquid more dense
The more particles it has meaning more collision and higher pressure
