Physics paper 1 keywords and equations 4.5 / 5 based on 2 ratings ? PhysicsPaper 1GCSEAQA Created by: GMay10Created on: 13-05-18 11:35 System An object or group of objects 1 of 38 Kinetic energy 0.5 x mass x (speed)2 2 of 38 Gravitational potential energy Mass x gravitational field strength x height 3 of 38 Elastic potential energy 0.5 x spring constant x (extension)2 4 of 38 Internal energy Total kinetic and potential energy of all the particles that make up a system 5 of 38 Specific heat capacity The amount required to raise the temperature of 1 kg of the substance by 1 degree celcius 6 of 38 Change in thermal energy Mass x specific heat capacity x temperature change 7 of 38 Dissipated Spread out to the surroundings 8 of 38 Renewable Can be replaced 9 of 38 Current The flow of electrical charge 10 of 38 Charge flow Current x time 11 of 38 Resistance Measure of how it resists the flow of charge 12 of 38 Potential difference The difference in electrical potential from one point in a circuit tot another 13 of 38 Potential difference Current x resistance 14 of 38 Ohmic conductor A resistor where the current is directly proportional to the potential difference at a constant temperature 15 of 38 Diode A current through this will only flow in one direction 16 of 38 Power Depends on the potential difference across it and the current flowing through it 17 of 38 Power Potential difference x current or (current)2 x resistance 18 of 38 Direct current Has a direct potential difference 19 of 38 Alternating current Has an alternating potential differnence 20 of 38 Efficiency The ratio of useful energy out to total energy in 21 of 38 Efficiency Useful energy transfer / Total energy transfer or Useful power output / total power input 22 of 38 Energy transferred Power x time or charge flow x potential difference 23 of 38 National grid A system of cables and transformers linking power stations to homes and buisnesses 24 of 38 States of matter Solids, liquids and gases 25 of 38 Incompressible Cannot be squashed 26 of 38 Density The mass per unit volume of a material 27 of 38 Density Mass / volume 28 of 38 Energy for a change of state Mass x specific latent heat 29 of 38 Latent heat of fusion The energy needed for a substance to change from solid to liquid 30 of 38 Latent heat of vaporisation The energy needed for a substance to change form liquid to gas 31 of 38 Sublimation Something changes from a solid to a gas without changing to a liquid in the middle 32 of 38 Atomic number The number of protons in an atom of an element 33 of 38 Isotopes Atoms of the same element that have different numbers of neutrons 34 of 38 Activity of a radioactive source The rate at which it decays 35 of 38 Contamination The unwanted presence of materials containing containing radioactive atoms of other materials 36 of 38 Irradiation The process of exposing an object to nuclear radiation 37 of 38 Half-life The average time it takes for half of the nuclei to decay 38 of 38
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