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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Thermistor
Device with a resistance that varies with temperature.
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Thinking distance
The distance travelled by the vehicle in the time it takes for the driver to react.
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Three-pin plug
A three-pin plug has a live pin, a neutral pin and an earth pin. The earth pin is used to earth the metal case of an appliance so the case cannot become live.
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Tide
Rise and fall of sea level because of the gravitational pull of the Moon and the Sun.
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Time period
Time taken for one complete cycle of oscillating motion.
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Total internal reflection
Occurs when the angle of incidence of a light ray in a transparent substance is greater than the critical angle. When this occurs, the angle of reflection is equal to the angle of incidence.
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Tracer
A small amount of a radioactive substance used to give information about a mechanical or biological system.
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Transformer
Electrical device used to change an (alternating) voltage. See also Step-up transformer and Step-down transformer.
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Transverse wave
Wave in which the vibrations are perpendicular to the direction of energy transfer.
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Turbine
A machine that uses steam or hot gas to turn a shaft.
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