Summary IB Physics notes: topic 2 (mechanics)

distance vs .
displacement Mct instantaneous vs .
average
°
distance distance
: travelled velocity
from A to B average Given displacement
:


definitions
,




scalar how fast body moves during
quantity a


displacement shortest a time interval tf
path velocity vs speed
°
: .



.




instantaneous : how fast
moved in a particular velocity displacement / time
:



direction and in which direction a body
!
vector
quantity
.




moment of the

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dgigtafanp.ae/gtiamne+i+y
9" speed :




rate of change of
unit : meter unit : meter 1 second
displacement

acceleration the rate of change of ( moving faster blower direction )
:
velocity or
change in

acceleration = velocity unit : meters / second
time




relative motion

motion is measured relative to the observer .
It is easiest to describe motion if the observer is

stationary

relative
velocity is measured rectorial ly (the rectorial addition of velocities )
if the observer's
moving at the same
velocity (direction and speed ) then the

relative
velocity is 0

if the observer speed but opposite direction then the
is
moving at the same
of the
relative
velocity is twice the
velocity moving object a


V y
One dimensional motion :



motion is simplified into perpendicular components to simplify motion ×
>




(V )
S displacement swat
u
. -




equations t
.




a



St EV
"
U: initial
velocity s ut t
'
z
at
' cutest
V

z

V final CV
:
velocity u)
-




' a
v u't 2 as t

A: acceleration v u ta t

f
the gradient of a displacement time
graph is
velocity
-




:
time
the
gradient of velocity acceleration
a time
graph is
-




the area under the
graph is displacement
the area under the acceleration -
time
graph is
velocity