Planet - Body that orbits a star, Star - ball of burning gas, Moon - body that orbits a planet, exoplanet - Planet outside our solar system, dwarf planet - planet too small to meet 'planet' status, solar system - collection of planets that orbit a central star, milkyway - the name given to our solar system, galaxy - collection of stars and planets, universe - all existing space matter, 1 volt - 1 joule per coulomb, acceleration - rate of change of speed, alternating current - direction of flow of charge repeatedly reverses, current - flow of charge per unit time, direct current - direction of flow of charge is in one direction, LED - only allows current to flow in one direction, Parallel circuit - more than 1 path for current to flow, potential difference - every transferred to charges in a circuit (voltage), Power - energy transferred per unit time, resistance - measure of opposition to the movement of charge, series circuit - only one path for current to flow, thermitor - resistance changes based on temperature (TURD), LDR - resistance changes based on light level (LURD), friction - the force that opposes motion, light year - distance travelled by light in one year, resultant force - a single force calculated from adding 2 or more forces together (sometimes in positive and negative directions), work done - energy required to move an object through a distance, kinetic theory - a model that explains the behaviour of particles of a gas, specific heat capacity - the value of heat energy required to raise the temp of 1kg by 1degC, temperature - mean kinetic energy of the particles of a substance, pressure - force per unit area,

N5 Physics Definitions

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