Mr Caseys Flash Cards
Which energy recourses are renewable?
Solar, wind, tidal, wave, geothermal, hydroelectric, biomass
Why are some energy resources more reliable than others?
Can generate electricity any time it’s needed
What are the effects on the environment of each energy resource?
Could be:Water pollution, visual pollution, habitat damage, radioactive waste
What is the equation for extension?
E=mcθ
What are the stores of energy?
Kinetic, gravitational, nuclear, elastic, thermal, chemical
Which energy resources are non renewable?
Coal, oil, gas, nuclear
What is a system?
An object or group of objects
What factors determine the gravitational potential energy of an object?
Ep=mgh (mass, gravitational field strength and height
What are the units of energy?
Joules(J)
For a spring, how are force, extension and the spring constant linked?
F=ke
What does the specific heat capacity of water is 4200J/kg°C mean?
Water needs 4200J of energy to increase the temperature of 1kg by 1°C
What are the 9 energy types?
Kinetic, heat, light, gravitational potential, chemical, sound, electrical, elastic, nuclear
What are the two laws of energy?
Energy cannot be created or destroyed, only transferred. Energy dissipates (spreads out) into less useful forms
How is efficiency calculated, in terms of energy, and power?
Useful energy/total energy x100
Useful power/total power x100
How do you calculate the kinetic energy of a moving object?
Ek=1/2mv squares
How can unwanted energy transfers be reduced by thermal insulation?
Reduced heat energy losses(by conduction, convention, radiation
What are the 11 main energy resources on Earth?
Coal, oil, gas, solar, wind, tidal, wave, geothermal, hydroelectric, nuclear, biomass
What does renewable mean?
It can be generated as quickly as it is used
What are the effects on the environment of fossil fuels?
When burnt…CO2 released into air…which adds to global warming
How can unwanted energy transfers be reduced by lubrication?
Reduced friction which reduces energy losses as heat
What is thermal conductivity?
How quickly heat energy is transferred (best in solids and metals)
What is power?
Rate of energy transfer or doing work
P=E/t
P=W/t
How does a force-extension graph change past the limit of proportionality?
No longer directly proportional (not a straight line)
