AQA GCSE Physics - Paper 1 Questions & Answers 100% Correct

Energy Stores - ANSWER1) Elastic potential 2) Gravitational potential 3) Thermal 4) Electrostatic 5) Nuclear 6) Chemical 7) Kinetic 8) Magnetic 9) Light 10) Sound How is energy transferred? - ANSWER1) Mechanically - force doing work 2) Electrically - work done by moving charges 3) Heating/Radiation - light, sound How can work be done? - ANSWERWhen a current flows or by a force moving an object Kinetic energy formula - ANSWERE=1/2mv² Kinetic energy(J) = 0.5 x mass(kg) x speed²(m/s) Gravitational potential energy formula - ANSWERE=mgh G.P.E(J) = mass(kg) x gravitational field strength (N/kg) x height (m) What happens when an object falls and there's no air resistance? - ANSWEREnergy lost from the g.p.e store = energy gained in the kinetic energy store What does air resistance do when acting against falling objects? - ANSWERIt causes some energy to be transferred to other energy stores e.g. the thermal energy stores of the object and the surroundings Elastic potential energy formula - ANSWERE=1/2ke² E.P.E(J) = 0.5 x spring constant(N/m) x extension²(m) What is SHC? - ANSWERThe amount of energy needed to raise the temperature of 1kg of a substance by 1°C SHC formula - ANSWERE=mcθ Change in thermal energy(J) = mass(kg) x SHC(J/kg/°C) x temperature change(°C) What is the conservation of energy principle? - ANSWEREnergy can be transferred usefully, or stored or dissipated (wasted energy), but can never be created or destroyed What is power? - ANSWERThe rate of energy transfer, or the rate of doing work What is 1W equal to? - ANSWER1J of energy transferred per second Power Equation 1 - ANSWERE=Pt Energy transferred(J) = power(W) x time(s) Power Equation 2 - ANSWERW=Pt Work done(J) = power(W) x time(s) What is conduction? - ANSWERThe process where vibrating particles transfer energy to neighbouring particles Energy is transferred to thermal stores of the object - this energy is shared across the kinetic energy stores What is thermal conductivity? - ANSWERA measure of how quickly energy is transferred through a material via conduction What is convection? - ANSWERWhere energetic particles move away from hotter to cooler regions Energy is transferred to the thermal energy stores of the object and is shared across the kinetic stores What do radiators create? - ANSWERConvection currents Convection currents - process - ANSWER1) Energy is transferred from the radiator to the nearby air particles by conduction 2) The air by the radiator becomes warmer and less dense as the particles move