Energy 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: Lo lo StudiesCreated on: 30-10-18 17:32 What is a system? An object or group of objects 1 of 18 What is a system change? A change in the way energy is stored 2 of 18 Name and describe the four energy pathways/carriers Mechanical-work done by a force, Electrical-work done by a current, Heat-temperature change, Radiation-light eg infrared 3 of 18 Kinetic energy formula 0.5 x mass x speed^2 4 of 18 Elastic potential energy formula 0.5 x spring constant x extension^2 5 of 18 Gravitational potential energy formula mass x gravitational field strength x height 6 of 18 Change in thermal energy formula Change in thermal energy = mass x specific heat capacity x temperature change 7 of 18 Power definition The rate at which energy is transferred or the rate at which work is done 8 of 18 Power formulas energy transferred/time or work done/time 9 of 18 Conservation of energy It can be transferred usefully, stored or dissipated, but can't be destroyed 10 of 18 Useful energy is... Transferred where it is wanted in the form it is wanted in 11 of 18 Wasteful energy is... Not usefully transferred 12 of 18 Energy transfers in a_____there is no_____in total energy closed system, net change 13 of 18 In all system changes... energy is dissipated/wasted 14 of 18 If the rate of transfer of heat energy is reduced, it is better at keeping thermal energy.This is achieved by: poor conductors(low conductivity)in the walls, thicker walls 15 of 18 What causes a thermal energy transfer build up? Friction 16 of 18 How do you reduce friction in moving parts? Lubrication 17 of 18 Efficiency formula useful energy/total energy transfer 18 of 18
Comments
No comments have yet been made