AQA Physics paper 1 Questions & Answers(RATED A)

Energy is transferred between stores - ANSWERThermal, kinetic, gravitational potential, elastic potential, chemical, magnetic, electrostatic, nuclear Energy is transferred... - ANSWERMechanically (by a force doing work), electrically (work done by moving charges), by heating or by radiation (like light or sound) When a system changes, energy is transferred - ANSWERIt can be transferred into or away from the system, between objects in the system or between different types of energy stores. Closed systems are where neither matter nor energy can enter or leave. The net change in the total energy of a closed system is always 0 kinetic energy - ANSWERenergy of motion - the greater an object's mass and the faster it is going, the more energy there will be in its kinetic energy store. Ek (j) = 1/2m(kg)v(m/s) squared Raised objects store energy in gravitational potential energy stores - ANSWERlifting an object in a gravitational field requires work, causing an energy transfer to the the GPE store of the object. Ep(j) = m(kg)g(n/kg)h(m) Falling objects transfer energy - ANSWERFalling objects transfer energy from its GPE store to its kinetic energy store. When there's no air resistance, energy lost from the GPE store = energy gained in the kinetic energy store Stretching transfers energy to elastic potential energy stores - ANSWERAs long as the limit of proportionality has not been exceeded, Ee (j) = 1/2 k (N/m) e (m) squared specific heat capacity - ANSWERthe energy required to raise the temperature of one gram of a substance by one degree Celsius. E (j) = m(kg) c(j/kgdegree) theta (degrees Celsius) Conservation of energy principle - ANSWEREnergy can be transferred but can never be created of destroyed Dissipated energy - ANSWERenergy used up in a system, typically lost due to work done by friction, 'wasted energy' Phone energy - ANSWERWhen you use the phone, energy is usefully transferred from the chemical energy store of the battery in the phone, but some of this energy is dissipated to thermal energy Closed system energy transfer - ANSWERA cold spoon is dropped into hot soup in an insulated flask, which is then sealed. Energy is transferred from the thermal energy store of the soup to the useless thermal energy of the spoon Power - ANSWERThe rate at which work is done (watts). P(w) = E(j) / t(s) Powerful machine - ANSWEROne which transfers a lot of energy in a short space of time Conduction occurs mainly in solids - ANSWERConduction is the process where vibrating particles transfer energy to neighbouring particles. Long definition of conduction - ANSWEREnergy transferred to an object by heating is transferred to the thermal store, which is shared across the kinetic store of the particles. The particles' collisions cause energy to be transferred between particles kinetic energy stores. thermal conductivity - ANSWERthe Mrs sure of the rate at which thermal energy can tra