P1P3 - Conservation of Energy Flashcards
What are the five/six stores?
- Gravitational potential energy
- Elastic potential
- Kinetic energy
- Chemical energy
- Nuclear energy
- Internal energy
What is added to your body’s chemical store when eating food?
Energy
What is internal store?
The energy stored by the particles that make up an object is called the internal energy of the object.
What is the equation for kinetic energy?
kinetic energy = 0.5 × mass × velocity^2
What is the equation for change in gravitational potential energy?
Change in GPE = mass x gravitational field strength x change in height
What are the energy transfers?
Heating
Waves
Electrical
Whats the equation for work done?
Work done = force x distance
What are some waste energy transfers/
Friction
Dissipation
Whats the equation for efficiency?
Efficiency =
(useful power output / total power input)
x 100.
The useful power output and total power input are measured in watts (W).
Whats the typical way to generate electricity?
Energy resource rotates a turbine
What are disadvantages of fossil fuels?
Not renewable.
Inefficient.
Contributes to global warming.
What are advantages of fossil fuels?
No nuclear waste
Reliable
Whats a disadvantage to using geothermal energy
Can only be used where there is volcanic activity close to the surface.
How is geothermal energy converted to electrical energy?
Magma heats rocks
Hot rocks transfers heat to water in pipes
A turbine is rotated
Turbine rotates a generator
What are some energy resources?
Geothermal
Solar
Nuclear
Tidal
Water/Hydroelectric
Wind
Fossil fuels
