Physics Unit 4 Definitions 4.0 / 5 PhysicsCapacitorsSimple harmonic motionMagnetic fieldsElectric fieldsMomentum and ImpulseA2/A-levelAQA Created by: natfarmer97Created on: 05-05-15 11:12 Density Mass per unit volume 1 of 17 Force (in terms of momentum) Rate of change of momentum 2 of 17 Simple Harmonic Motion Oscillation where acceleration id directly proportional to the displacement and directly towards the equillibrium 3 of 17 Periodic Force A force applied at regular intervals 4 of 17 Natural frequency The frequency of a system's oscillation without a force 5 of 17 Forced oscillation Oscillation produced when a periodic force is applied 6 of 17 Force between two masses The force between two masses is attractive and proportional to the product of the masses and inversely proportional to the square of their separation 7 of 17 Magnetic field The region around a magnetic material or a moving electric charge within which the force of magnetism acts 8 of 17 Magnetic flux density Magnetic force per unit length per unit current on a current carrying conductor which acts at right angles to the field lines 9 of 17 Faraday's Law Induced emf is proportional to the rate of change of flux 10 of 17 Flux Linkage How much flux goes through the coil 11 of 17 Lenz's Law Direction of the induced emf is such that it resists the charge causing it 12 of 17 Electric fields Volume where a force acts on a charge due to its charge 13 of 17 Electric field strength Force per unit charge 14 of 17 Electric potential of a point in space Work done per unit charge to move a charge to that point from infinity 15 of 17 Capacitance Charge stored per unit volt 16 of 17 1 Farad 1 coulomb stores for 1 volt across a capacitor 17 of 17

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