Physics
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- Created by: Connor
- Created on: 27-11-12 20:31
Acceleration
change of velocity per second in meters per seconds (m/s2)
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Amplitude
he maximum disturbance of the particles in a substance
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big bang theory
the theory that the universe was created in a massive explosion and that the universe has been expanding ever since
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breaking distance
the distance travelled by a vehicle during the time it brakes
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cable
two or three insulated wires surrounded by an outer layer of rubber or flexible plastic
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circuit
components connected together so that current passes through them
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conduction
heat transfer in a substance due to motion of particles in the substance
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convection
heat transfer in a liquid or gas due to convection currents
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convection currents
the flow of a fluid due to differences in tempreture
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decleration
change of velocity per second when an object slows down
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diffusion
spreading out of particles away from eachother
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doppler effect
the change of wavelength and frequency of the waves from a moving source due to the motion
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efficiency
useful energy transferred by a deivce divided by total energy supplied to the device
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electromagnetic waves
electric and magnetic disturbances that transfer energy from one place to another
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force
a force can change the motion of an object
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frequency
the number of complete waves passing a point each second, the unit is hertz (Hz)
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friction force
a force opposing the relative motion of two surfaces where hey are in contact with each other
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global dimming
a gradual reduction in the amount of light reaching the earths surface due to particles in the atmosphere
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global warming
warming of the earth due to greenhouse gases in the atmosphere trapping infrared radition
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heat trasnsfer
energy transfer due to a tempreture difference
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infra-red radiation
electromagnetic waves between visible light and microwaves in the electromagnetic spectrum
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kinetic energy
energy of a moving object due to its motion
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national grid
the network cables and transformers used to transfer electricity from powerstations to homes
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neutrons
neutral particles found in the nucleus of an atom
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nuclear energy
energy released from unstable atom as a result of a change in its nucleas
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nuclear fission
the process of spilliting atoms
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ohms law
the current through a resistor at constant temprature is directly proportional
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pay back time
the length of time for the savings from an improvement to match the actual cost of improvement
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photosynthesis
the process by which plants make food using carbon dioxide, water and light
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pitch
depends on the frequency of the sound waves that make up a sound
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potential difference
a measure of the difference in electric potential energy per unit charge between two charged objects
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protons
positive particles found in the nucleus of the atom
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radiation
energy carried by waves
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red shift
increase in the wavelength of electromagnetic waves emitted by a star or galaxy due to its motion away from us
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refraction
the change of the direction of a light ray when it passes across a boundary between two transparent substances
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sankey diagram
diagram to show the energy transfer through a device
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solar cell
electrical cell that produces a voltage when in sunlight, solar cells are usually connected together in solar cell panels
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speed
distance travelled per second (in meters/seconds)
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terminal velocity
the velocity reached by an object when the drag force on it is equal and opposite to the force making it move
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transformer
electrical device used to change an voltage
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step up transformer
this is used to step up, eg. from a powerstation to the grid
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step down transformer
this is used to step the voltage down eg. from the grid voltage
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ultrasonic waves
sound waves abov the frequency range of the human ear
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virtual image
a image seen in a mirror from which light rays appear to come after being reflected by the mirror
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volt
the unit of potential difference, equal to energy transfer per unit in joules per coloumb
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wavelength
the distance from one wavepeak to the next wave peak along the waves
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Other cards in this set
Card 2
Front
Amplitude
Back
he maximum disturbance of the particles in a substance
Card 3
Front
big bang theory
Back
Card 4
Front
breaking distance
Back
Card 5
Front
cable
Back
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