energy (physics) 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: abi2422Created on: 14-11-20 17:07 name 8 energy stores thermal, kinetic, gravitational potential, elastic potential, chemical, magnetic, electrostatic, nuclear 1 of 26 what happens when a system changes? energy is transferred 2 of 26 what are closed systems? systems where neither matter or energy can leave 3 of 26 what is the net change in the total energy for a closed system? always zero 4 of 26 what is the formula for kinetic energy? (word and symbol formula) Ek = (1/2)mv^2 kinetic energy = (1/2) x mass x (speed)^2 5 of 26 will there be more or less energy in an object's kinetic energy store if it has a high mass and speed? more 6 of 26 what is the gravitational potential energy (g.p.e.) formula? (word and symbol formula) Ep = mgh g.p.e. = mass x gravitational field strength x height 7 of 26 what is the elastic potential energy formula? (word and symbol formula) Ee = (1/2)ke^2 elastic potential energy = (1/2) x spring constant x extension^2 8 of 26 what is the formula for specific heat capacity? (word and symbol formula) △ E = mc △ θ change in thermal energy = mass x specific heat capacity x temperature change 9 of 26 what is specific heat capacity? the amount of energy needed to raise the temperature of 1kg of a substance by 1 degree C 10 of 26 what is the conservation of energy principle? energy can be transferred usefully, stored or dissipated, but can never be created or destroyed 11 of 26 what is the formula involving power, time, and energy transferred? (word and symbol) P = e/t power = (energy transferred) / (time) 12 of 26 what is the formula involving work done, power and time? (word and symbol) P = w/t power = (work done) / (time) 13 of 26 what is conduction? the process where vibrating particles transfer energy to neighbouring particles 14 of 26 do materials with low thermal conductivity transfer energy between their particles quickly or slowly? slowly 15 of 26 where does conduction mainly take place? in solids 16 of 26 where does convection mainly take place? in liquids and gases 17 of 26 what is convection? where energetic particles move away from hotter to cooler regions 18 of 26 how are convection currents formed? if there is a constant heat source 19 of 26 what does insulation do? reduces the rate of energy transfer by heating 20 of 26 what is the efficiency equation involving energy transfer? efficiency = (useful output energy transfer) / (total input energy transfer) 21 of 26 what is the efficiency formula involving power? efficiency = (useful power output) / (total power input) 22 of 26 what are the 3 main fossil fuels? coal, oil and gas 23 of 26 what are the main renewable energy sources? sun, wind, water waves, hydro-electricity, bio-fuel, tides and geothermal 24 of 26 what are bio-fuels? renewable energy resources created from either plant products or animal waste 25 of 26 what are the units for power? watts (W) 26 of 26
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