Measurement.

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Presentation transcript:

Measurement

Introducing Physics This is the study of matter, energy, forces and their interactions. It involves the study of natural phenomena and events in quantities which can be measured. These physical quantities are measured in units. We use System International (SI) units

Some SI Units Physical Quantity Unit Symbol Distance (d) Metre m Time (t) Second s Speed (velocity) (v) Metres per second ms-1 Acceleration (a) Metres per second squared ms-2

Some SI Units Physical Quantity Unit Symbol Mass (m) Kilogram kg Energy (E) Joule J Work (W) Power (P) watt W

Some SI Units Physical Quantity Unit Symbol Force (F) Newton N Weight (Fg) Current (I) Ampere / amp A Voltage (V) volt V

Some SI Units Physical Quantity Unit Symbol Electric Resistance (R) ohms Ω Pressure pascal Pa

Prefixes You Should Know… Giga = 109 (billion) Mega = 106 (million) Kilo = 103 (Thousand) Centi = 10-2 (hundredth) Milli = 10-3 (thousandth) Micro = 10-6 (millionth) Nano = 10-9 (billionth) Pico = 10-12 (trillionth)