# Physics Definition of Terms

Jun 16th, 2015
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Physics - the study of matter and energy. Base quantity - cannot be defined in terms of other physical quantities. Derived quantity - can be derived by the combination of 2 or more base quantities either by multiplication , division or both. Standard form - A (1-10) x 10. Scalar Quantity - A quantity that has magnitude only. (Distance , speed , mass)

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Physics - the study of matter and energy.Base quantity - cannot be defined in terms of other physical quantities.Derived quantity - can be derived by the combination of 2 or more base quantities either by multiplication , division or both.Standard form - A (1-10) x 10Scalar Quantity - A quantity that has magnitude only. (Distance , speed , mass)Vector Quantity - A quantity that has both magnitude and direction. (displacement , weight , acceleration)Systematic error - either more/less than the actual value. (zero error)Random error - either lower/more than the actual value. (parallex error)Consistency/Precision - the ability to register the same reading when a measurement is repeated.Accuracy - the degree to which a measurement represent the actual value.Sensitivity - the ability of a measuring instrument to detect a small change in the quantity being measured.Speed - the rate of change of distance.Velocity - the rate of change of displacement.Acceleration - the rate of change of velocity.Acceleration = 0 : constant velocity or at rest. ( no change in velocity)Constant acceleration - Increasing velocity (+ve)Constant deceleration - Decreasing velocity (-ve)

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