Energy

• Name 5 energy stores

  Thermal, Kinetic, Chemical, Gravitational, Elastic, Magnetic, Nuclear
• What cannot leave a closed system?

  Matter and Energy
• 3 ways energy is transferred

  Heating, Work done eletrically and mechanically
• Formula for Kinetic Energy Calculation

  KE = 1/2mv^2 M=mass V=Velocity(m/s^2)
• Gravitational Potential Energy Calculation

  EP=mgh M=mass G=field strength(N/kg) H=height
• Elastic Potential Energy Calculation

  EE=1/2KE^2 K=spring constant(N/m) E=extension(m)
• Specific Heat Capacity Calculation

  ΔE = mcΔθ change in thermal energy(j)=mass x shc(j/kg°C) x temp change (°C
• Energy cannot be.....

  Created or destroyed only transferred
• Conduction is when

  Vibrating particles transfer energy to neighbouring particles
• Convection is when

  energetic particles move away from hotter to cooler regions(liquid and gas)
• Lubrication reduces

  Frictional forces
• Insulation reduces

  the rate of energy transfer by heating
• Most energy transfers involve

  Waste energy
• Efficieny Equations

  useful output energy transfer/total input energy transfer

  useful power output/total power input
• 3 non-renewable energy resources

  Coal, Oil, Gas
• 3 Renewable Resources that will never run out

  Sun, Wind, Waves, tides