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# notes_ch01 - Ch 1 Unit Systems I 2 Main Unit Systems...

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Ch. 1 Unit Systems I) 2 Main Unit Systems MKS (SI): (Metric) (System International) British min (minutes) min (minutes) Time sec (seconds) hrs (hours) sec (seconds) hrs (hours) days days cm (centimeters) in (inches) Distance m (meters) km (kilometers) ft (feet) yd (yards) miles cm (centimeters) in (inches) Displacement m (meters) km (kilometers) ft (feet) yd (yards) miles cm/s mile/sec Speed (rate) m/s km/hr ft/s mile/hr (MPH) km/s cm/s mile/sec Velocity m/s km/hr ft/s mile/hr (MPH) km/s Mass kg (kilogram) gram slug stone Weight N (Newton) kN Lb. (pound) Force N (Newton) kN Lb. (pound) km/hr/sec miles/hr/sec Acceleration m/s² km/hr² ft/s² miles/hr² Work N-m (Joule) kJ ft - Lb Energy N-m (Joule) kJ ft - Lb Joules = Watt ft - Lb (1 hp = 550 ft-Lb ) Power sec sec sec II) Conversions Time Distance & Displacement 60 sec = 1 min 100 cm = 1 m 60 min = 1 hr 1000m = 1 km 3600 sec = 1 hr 12 in. = 1 ft 365.25 days = I yr (year) 3 ft = 1 yd 5280 ft = 1 mile Mass to Weight 1 kg = 9.8 N 1 slug = 32 lbs

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III) Criss-cross Conversions between the 2 systems Distance & Displacement Mass to Weight 1 in = 2.54 cm 1 kg = 2.2 lbs 1 mile = 1.6 km Gravitational force on earth g = 9.8 m/s² g = 32 ft/s² Example #1 A person weighs 200 lbs on Earth. What is their weight in N (Newtons) and their mass in slugs and
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