IEB Grade 12 Vectors, graphs of motion, different forces notes

-




and direction
>
physical quantity which has magnitude (size )
>
eg position displacement velocity
,
,
,
acceleration

> direction

tail
1 magnitude
them
original
>
as the
resultant vector is a
single vector which has the same effect vectors


acting together


scalars

>
physical quantity which has magnitude only
>
eg distance , speed ,
mass
,
time




Position (X )

> reference point is where we measure the position of an object
> use positive (t ) and negative C- 1 signs to denote direction



Distance
>
length of path travelled ( scalar )

0°

Direction
270° -90°

stated as
bearing
>

1800



Displacement
>
change in
position of a body ( vector )
Atl g 40M
•
B




30M¥
displacement at C

* " "° " "
"




30M 50m at 126,87°
I =
tan -11%8-1=36,870

D•
•


40M C

, distance
speed average speed
=

time

rate of of distance ( scalar )
change
>




velocity average velocity
=
di%¥m%M ( constant velocity )
> rate of change of displacement ( vector )
>
instantaneous velocity is the
velocity at a
particular instant in time



change in velocity
Acceleration acceleration =

time

rate in
>
change of velocity


*
projectiles take the same time to reach their
greatest height from the point of
upward launch as
they take to fall back to the
point of launch