Module 2: Important Math Skills Flashcards
precision
the precision of a measurement depends on the instrument used to make it
significant figures
the way to state your knowledge precisely
time
seconds (s)
length
meter (m)
mass
kilogram (kg)
M
mega
10^6
k
kilo
10^3
c
centi
10^-2
m
milli
10^-3
µ
micro
10^-6
n
nano
10^-9
useful unit conversions
order og magnitude estimate
a one significant figure estimate or calculation
~ :(less precision than “approximately equal sign))
scalar quantity
when a physical quantity is described by a single number (with a unit)
can be positive, negative, or zero
time, temperature, mass
some approximate conversion factors
vector quantity
quantity that has both a size and a direction
magnitiude
size/length of a vector
displacement vector
specifies how far an object moves and in what direction; has both magnitude and direction
two displacement vectors
t/f: an object’s displacement vector is drawn from the object’s initial position to its final position, regardless of the actual path followed between these two points
true
sam undergoes two displacements
net displacement
adding vectors
relating sides and angles of right triangles using trigonometry
see figure 1.23 in TB
velocity is a vector quantitiy because…
its specification involves how fast an object is moving and also the direction in which the object is moving
the motion diagram for a car starting from rest
