physics core key defintions 0.0 / 5 ? PhysicsEquations and FormulaeGCSEEdexcel Created by: lucyallinson1Created on: 17-04-17 21:14 amplitude the height of the wave above the normal line 1 of 34 current a flow of charge 2 of 34 density the mass of a substance per unit volume, measures in g/cm3 3 of 34 distance the length of space between two points, measured in metres 4 of 34 elastic potential energy the energy stored by things that have been stretched or squashed and can spring back 5 of 34 electrical energy energy transferred by electricity 6 of 34 energy the capacity for doing work 7 of 34 electricity a flow of charged particle that can be used to transfer energy 8 of 34 eyepiece lens the lens on a telescope that a person looks through in a telescope 9 of 34 focal length the distance from a convex lens to the point where the image of a very distant object is produced 10 of 34 frequency the number of waves passing a point each second 11 of 34 fusion reaction when the nuclei of two atoms join together and release energy 12 of 34 gravitational potential energy the energy stored in things that can fall 13 of 34 induced current the current that flows in a wire that is moving relative to a magnetic field 14 of 34 infrared electromagnetic radiation that we feel as heat 15 of 34 infrasound sound waves with a frequency below 20 Hz (which is to low for humans to hear) 16 of 34 ion an atom that has become electrically charged 17 of 34 joule the unit of energy 18 of 34 kilowatt a unit for measuring power 19 of 34 kilowatt-hour the amount of energy transferred in an hour by a 1kw appliance 20 of 34 kinetic energy movement energy 21 of 34 light energy the energy of visible light 22 of 34 power how quickly something transfers energy 23 of 34 pitch whether a sound is low or high 24 of 34 refraction the change of speed and direction of a wave when it enters a new material 25 of 34 sonar a way of finding the distance to an underwater object, by timing how long it takes the pulse of ultrasound to be reflected 26 of 34 thermal energy energy transferred by heating 27 of 34 ultrasound sound waves with a frequency above 20,000 Hz, (which is to high for humans to hear) 28 of 34 ultraviolet electromagnetic radiation that has a shorter wavelength than visible light. but longer than x-rays 29 of 34 visible light electromagnetic waves that can be detected by the human eye 30 of 34 voltage a measure of the amount of energy transferred by a current 31 of 34 watt the unit of measuring power. 1 watt=1 joule of energy transferred every second 32 of 34 wave speed the distance that a wave travels in one second 33 of 34 wavelength the distance between a point on one wave, and the same point on the next wave 34 of 34
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