Transcription of Notes - Uncertainties and Methods - AQA Physics A-Level
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Notes - Uncertainties and Methods - AQA Physics A-Level
AQA Physics A Level Uncertainties and Methods Notes Measurements and their errors - Uses of SI units and their prefixes SI units are the fundamental units, they are made up of: Mass (m): kg (kilograms) Length (l): m (metres) Time (t): s (seconds) Amount of substance (n): mol ( moles) Temperature (t): K (kelvin) Electric current (I): A (amperes) The SI units of quantities can be derived by their equation, F=ma For example, to find the SI units of force (F) multiply the units of mass and acceleration kg x m gives kgm (Also known as N)s 2s 2 The SI units of voltage can be found by a series of steps: V= where E is energy and Q is charge , E= m so the SI units for energy is kgQEv2 (the units for speed (v) are so squaring these gives )sm2 2sm 1sm2 2 Q=It (where I is current) so the units for
AQA Physics A Level Uncertainties and Methods Notes www.pmt.education. 3.1 Measurements and their errors 3.1.1 - Uses of SI units and their prefixes SI units are the fundamental units, they are made up of: Mass (m): kg (kilograms) Length (l): m (metres) Time (t): s (seconds) ...
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