More Related Content Similar to Introductory Physics - Physical Quantities, Units and Measurement (20) Introductory Physics - Physical Quantities, Units and Measurement7. 7
Terminology
Consider the following:
You can feel the effects of a force (throwing you off) as you
stand at the edge on a merry‐go‐round while it is spinning.
You can see that one line is longer than the other.
Physical
something that is real in the sense that it can be
seen, felt, etc. (i.e. not imaginary) and can thus be
described in terms of what you observe or perceive
http://en.wikipedia.org/wiki/Physical_property
© Sutharsan John Isles
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SI Base Quantities & Units
Quantity Symbol Unit Abbreviation
Length l metre m
Mass m kilogram kg
Time t seconds s
Electric current I ampere A
Thermodynamic temperature T kelvin K
Amount of substance n mole mol
Luminous intensity Iv candela cd
http://www.bipm.org/en/si/si_brochure/chapter2/2‐1/
© Sutharsan John Isles
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Common SI Prefixes for Units
Prefix Symbol Value Decimal Equivalent Scale (Short)
peta P 1015 1 000 000 000 000 000 quadrillion
tera T 1012 1 000 000 000 000 trillion
giga G 109 1 000 000 000 billion
mega M 106 1 000 000 million
kilo k 103 1 000 thousand
deci d 10-1 0.1 tenth
centi c 10-2 0.01 hundredth
milli m 10-3 0.001 thousandth
micro μ 10-6 0.000 001 millionth
nano n 10-9 0.000 000 001 billionth
http://en.wikipedia.org/wiki/Long_and_short_scales
© Sutharsan John Isles
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SI Derived Quantities & Units
Name Symbol Derivation Unit
area A m × m m2
volume V m2 × m m3
speed, velocity v m ÷ s m/s
acceleration a m/s ÷ s m/s2
density ρ kg ÷ m3 kg/m3
force F kg × m/s2 kg m/s2 = N
pressure P N ÷ m2 N/m2 = Pa
energy, work E, W N × m N m = J
power P J ÷ s J/s = W
electrical charge Q A × s A s = C
electric potential difference V W ÷ A W/A = V
electrical resistance R V ÷ A V/A = Ω
moment of force (torque) τ (or M) N × m N m
Note highlighted: Essence of derivation in each case is different.
© Sutharsan John Isles
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Acknowledgement
Created by: Sutharsan John Isles
Mathematica fonts by Wolfram Research, Inc.
References
http://www.wikipedia.org
http://www.bipm.org/en/home/
Giancoli, D.C. (2005). Physics: Principles with applications. Upper
Saddle River, NJ: Pearson Education, Inc.
Duncan, T. (2000). Advanced physics. London, UK: Hodder Murray.
Chang, R. (1994). Chemistry. Hightstown, NJ: McGraw‐Hill, Inc.
Hughes, E. (1888). Hughes electrical and electronic technology (10th
ed.). Harlow, England: Pearson Education Limited
Poh, L.Y. (2007). Effective guide to ‘O’ Level Physics (2nd ed.).
Singapore: Pearson Education South Asia Pte Ltd.
Billstein, R., Libeskind, S. & Lott, J.W. (2001). A problem solving
approach to mathematics for elementary school teachers. (7th ed.).
Reading, MA: Addison Wesley Longman
© Sutharsan John Isles