A-Level Physics OCR A Summary Paper and Study Guide

• Acceleration - AnsRate of change of velocity. Vector quantity • Acceleration of free fall - AnsRate of change of velocity of object falling in a gravitational field • air resistance - AnsDrag/resistive force experienced by objects moving through air • Ammeter - AnsDevice used to measure electric current-placed in series (ideally 0 resistance) • ampère - AnsBase SI unit of electric current, A, current flowing in two parallel wires in a vacuum 1m apart such that atractive force 2.0*10-7 per metre length of wire between them • amplitude - AnsMax displacement from equlibrium point of a particle in a wave • angle of incidence - AnsAngle between direction of travel of incident ray and normal • angle of reflection - Ansangle between direction of travel of reflected ray and normal • anion - Ansnegatively charged ion -attracted to anode • antiparallel - AnsSame line but opposite directions • antiphase - AnsParticles ocillating where one reaches max displ. whilst other reaches min displ. • Archimedes' Principle - AnsUpthrust on a object in fluid equals weight of fluid it displaces • average speed - AnsRate of change of distance in time • average velocity - Ansrate of change of displacement in time • base unit - Ansone of 7 units that form building blocks of SI measurements • battery - Anscollection of cells that transfer chemical energy to electrical energy • braking distance - Ansdistance travelled by vehicle from time brakes applied to full stop • breaking strength - Ansstress value at point of fracture-breaking force diveded by cross sectional area • brittle - Anslack of ability of plasticity • capacitor - Anscompenent that stores charge, consists of 2 plates seperated by an insulator • cathode - Ansnegatively charge electrode • cation - Ansposiively charge ion that is attracted to cathode • cell - Ansdevice that transfers chemical energy into electrical energy • centre of gravity - Ansimaginary point at which entire weight of object appears to act • centre of mass - Anspoint through which any fexternal force applied makes straight line motion but no rotation • charge carrier - Ansparticle with charge that moves through material to form electric current • closed system - Ansisolated system that has no interaction with surroundings • coherence - Anstwo waves that are coherent have same constant phase difference • compression - Ansa region in which medium is denser or has higher pressure than surrounding medium • compressive deformation - Anschange in shape of object due to compressive forces • compressive force - Ans2 or more forces acting together that reduce leng