# Lect_01 - How does Physics work units Observe and measure...

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How does Physics work? Observe and measure Build a model Make a prediction math math math math math math check units SI Units Length : The meter (1 m = 3.281 ft) Mass : The kilogram (1 kg = 0.06585 slug) Not the same as weight! on Earth 1 kg weighs 2.205 lb on the Moon 1 kg weighs 0.368 lb Time : The second (s) Used by scientific and engineering communities and almost everywhere in the world. Combinations: Unit of speed m/s Unit of force (Newton) is 1 N =1 kg m/s² Multiples of Units Y yotta- 10 24 Z zetta- 10 21 E exa- 10 18 P peta- 10 15 T tera- 10 12 G giga- 10 9 M mega- 10 6 k kilo- 10 3 c centi- 10 -2 m milli- 10 -3 µ micro- 10 -6 n nano- 10 -9 p pico- 10 -12 f femto- 10 -15 a atto- 10 -18 z zepto- 10 -21 y yocto- 10 -24 Formal conversion of units: •Multiply by the appropriate representation of 1 to cancel the unwanted units away: •eg. convert 10 mph into m/s = × × = mile 1 m 1609 s 3600 h 1 h mile 10 h mile 10 m/s 47 . 4 =

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