AS key facts 0.0 / 5 ? PhysicsALLASOCR Created by: danCreated on: 03-03-14 21:37 What is a Scalar quantity? One that has a Magnatude but no direction 1 of 24 What is a Vector quantity? Once that has magnitude and direction 2 of 24 What is Acceleration? Rate of change of verlocity 3 of 24 What is a Newton? It is a force that causes a mass of one kilogram to have an acceleration of one metre per second every second 4 of 24 What is a couple? It is a pair of equal and parallel but opposite, which tend to produce a rotation only 5 of 24 What is a moment? It is the force multiplied by the perpendicular distance 6 of 24 What is Density? Mass per unit volume 7 of 24 What is pressure? Force per unit area 8 of 24 What is what is one Joule? the work done when a force of one newton moves its point of application one metre 9 of 24 What is a watt? One joule per second 10 of 24 What is stress? The force per unit cross-section 11 of 24 What is strain? Extension per unit length 12 of 24 What is Charge? Current x Time 13 of 24 What is a coulomb? total charge supplied by a current of one amp in one second 14 of 24 What is Kirchhoff's first law? The sum of the current entering any junction is always equal to the currant leaving a junction. 15 of 24 What is Electromotive force (E.M.F)? the energy transferred per unit charge when one other type of energy is converted into electrical energy 16 of 24 What is potential differance? the electrical energy transferred per unit charge when electrical energy is converted into another form of energy 17 of 24 What is Ohm's law? the current through a conductor is proportional to the potential difference across it provided conditions remain constant 18 of 24 How to find the resistivity of a wire Resistance x cross-sectional area / length of wire 19 of 24 what is a kilowatt-houre (kWh)? it is 1000 watts for 3600 seconds so therefore 3600000J 20 of 24 What is a node? it is a point in a stationary wave at which there is no displacement of the particals at any time 21 of 24 What is an antinode? the displacement of the particles in a stationary wave varies by the maximum amount 22 of 24 What is an electronvolt? it is the energy an electron, with charge -1.6x10^-19C, acquires when it rises through a potential differance of one volt 23 of 24 What is the threshold frequency? it is the lowest frequency of radiation that will result in the emission of electrons from a particular metal surface 24 of 24
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