Physics - Unit 4 - Definitions 0.0 / 5 ? PhysicsUnit 4A2/A-levelAQA Created by: SamNoelCreated on: 23-03-16 16:59 Conservation of Momentum In the absence of external forces, the total momentum of a system is conserved 1 of 31 Newton's Second Law Rate of change of momentum is directly proportional to the resultant force which acts upon it 2 of 31 Impulse Change in momentum of a body 3 of 31 Simple Harmonic Motion An oscillation in which the acceleration is directly proportional to the displacement from the mid-point, and is directed towards the mid-point 4 of 31 Resonance When the driving force equals the natural frequency and causes the amplitude to rapidly increase 5 of 31 Damping When energy is lost to surroundings causing amplitude of an oscillation to decrease 6 of 31 Gravitational Potential Work done per unit mass to move a small test mass from infinity to a point 7 of 31 Electrical Potential Work done per unit charge to move a positive test charge from infinity to a point 8 of 31 Faraday's Law Induced emf is directly proportional to the rate of change of flux linkage 9 of 31 Lenz's Law Induced emf is always in such a direction as to oppose the change that caused it 10 of 31 Elastic Collision Both momentum and kinetic energy are conserved 11 of 31 Inelastic Collision Momentum is conserved, but kinetic energy is not 12 of 31 Gravitational Field Strength Force acting per unit mass at any point 13 of 31 Electric Field Strength Force acting per unit charge at any point 14 of 31 Magnetic Field Strength Force on one metre of wire carrying a current of one amp at right angles to the magnetic field 15 of 31 Magnetic Flux Density Measure of strength of the magnetic field per unit area 16 of 31 Angular Speed Angle an object rotates through per second 17 of 31 Centripetal Acceleration Force which keeps the object moving in a circle 18 of 31 Gravitational Potential Difference Energy needed to move a unit mass 19 of 31 Electrical Potential Difference Energy needed to move a unit charge 20 of 31 Force on a Wire Force is proportional to the magnetic field strength 21 of 31 Flux Linkage emf induced by changing the magnitude or direction of magnetic flux 22 of 31 Flux Change Change in flux of one weber per second will induce an emf of one volt in a loop of wire 23 of 31 Newton One Newton will give a 1kg mass, an acceleration of one metre per second 24 of 31 Linear Momentum Mass of an object multiplied by its velocity 25 of 31 Radian One radian is the angle subtended at the centre of a circle by an arc of length equal to the circles radius 26 of 31 Period Time taken for an object in circular motion to complete one revolution 27 of 31 Fields Region in which a force operates 28 of 31 Capacitance Amount of charge stored per volt 29 of 31 Magnetic Field Region where a force is exerted on magnetic materials 30 of 31 Alternator Generates alternating current 31 of 31
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