Key words Physics unit 4 0.0 / 5 ? Physicskey wordsA2/A-levelAQA Created by: SophieCreated on: 20-01-15 13:22 93467102158 Across 1. unwanted induced currents in metal parts of ac machines (4, 8) 5. when two objects fly apart, the carry equal and opposite momentum (9) 6. the amplitude of vibration of an oscillating system subjected to a periodic driving force has the same frequency as resonant frequency (9) 8. emf induced in the spinning coil of an electric motor or in any coil in which the current is changing. It acts against the applied pd (4, 3) Down 2. =BA for a uniform magnetic field of flux density B that is perpendicular to area A (8, 4) 3. the resultant force on an object that moves along a circular path. For an object of mass moving at speed v along circular path radius r the F=mv^2/r towards the centre of the circle (11, 5) 4. a force that varies regularly in magnitude with a define time period (8, 5) 7. when a current is induced by electromagnetic induction, the direction of the induced current is always such as to oppose the change that causes it (5, 3) 9. oscillations of a system that is subjected to an external periodic force (6, 12) 10. a line/surface in a field along which the electric/gravitational potential is at a constant (13)
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