PS Basics - CHAP 1 Flashcards
Intro to Science
Define: SI
le Systeme Internationale d’Unites (bad French) or the International System of Units
SI is a system of international “Base Units” so scientists from wherever on the globe can share data/results easier
does NOT include area, pressure, weight, force, speed, etc.
Define: Derived Units
the/a combination of the SI Base Units to help cover
area, pressure, weight, force, speed with more accuracy (ex: 22 m^2 or 22 square meters)
SI Base Unit for LENGTH
meter (m)
SI Base Unit for MASS
kilogram (kg)
SI Base Unit for TIME
second (s)
SI Base Unit for TEMP
Kelvin (K)
SI Base Unit for ELECTRIC CURRENT
ampere (A)
SI Base Unit for Amount Of Substance
mole (mol)
SI Base Unit for Luminous Intensity
candela (cd)
Define: SI Prefixes
used for very large or very small measurements to represent “scope”
kilo- (k)
thousand 1.000
mega- (M)
million 1,000,000
deci- (d)
tenth 0.1
10^-1
giga- (G)
billion 1,000,000,000
centi- (c)
hundredth 0.01
10^-2
milli- (m)
thousandth 0.001
10^-3
micro- (µ/mc)
millionth 0.000001
10^-6
nano- (n)
billionth 0.000000001
10^-9
To convert between larger to smaller numbers/units, you ____.
Multiply!
ex. 1.85m(100cm/1m) = 185cm
To convert between smaller to larger numbers/units, you ____.
Divide!
ex. 185cm(1m/100cm) = 1.85m
Explain: Mass vs. Weight
mass = quantity of matter
weight = the force with which Earth’s gravity pulls on the quantity of matter
ex. You would weigh less on Mars or the Moon, but your mass would be the same on Earth or any other planet
1 cc (cubic centimeter or cm^3) equals what?
1mL (milliliter)
Define: Scientific Notation
simple numbers multiplied by the power of 10
Define: Significant Figures
a prescribed decimal place that determines the amount of rounding off to be done based on the precision of the measurement (ex. 4.1 has 2 SFs)
SFs tell you how PRECISE a measurement is but not how ACCURATE (ex. tape measure with a broken tip can read 4.14 precisely, but the # isn’t accurate due to the tool)
