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QuestionAnswer
What is a system An object or group of objects
What is a closed system A system in which energy can't enter or leave
Define kinetic energy The energy stored in a moving object
What is the equation for kinetic energy Ek=1/2mv^2
Define elastic energy The energy stored in a stretched object
What is the equation for elastic energy Ee=1/2ke^2
Define gravitational potential energy The energy stored due to an objects hieght above the ground
What's the equation for gravitational potential energy Ep=mgh
∆E= mc∆theta
Define specific heat capacity The energy required to raise the temperature by 1°C
Define thermal energy The energy stored due to an objects temperature
Define power The rate of energy transfer or the rate at which work is done
What is the equation for power Power=energy transferred÷time or Power=work done÷time
What is the law for conservation of energy Energy cannot be created or destroyed only transferred
Friction causes... ... energy to be transferred to thermal enery
How can we reduce unwanted energy transfer Reduce friction
How can we reduce friction Use a lubricant Remove air particles
What happens when we raise thermal conductivity The rate of energy transfer increases
How can we reduce the thermal energy transfer of a building Use materials with low thermal conductivity or build thicker walls
What is the equation for efficiency Useful energy/total energy
What are the 3 types of fossil fuels Coal oil and gas
What are the advantages of fossil fuels Reliable, release lots of energy, abundant, cheap, versatile
What are the disadvantages of fossil fuels Releases CO2, non renuable, releases pollutants
What are the advantages of nuclear power No CO2, reliable
What are the disadvantages of nuclear power Radioactive materials, decommissioning takes a long time, radioactive waste
What is a renuable energy source A resource that can be replenished as we use it
What are the 7 types of renuable energy sources Wind, solar, hydroelectric, tidal, biofuels, geothermic, wave
What are the advantages of renuables Don't run out,no CO2 emissions, hydroelectric tidal wave and geothermic are reliable
What are the disadvantages of renuables Hard to use for transport, hydroelectric and tidal can destroy habitats, wind and solar are unreliable
Created by: Liam P