Summary
Summary Vertical projectile motion
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Summary of IEB Physical Sciences Vertical Projectile Motion section.
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VERTICAL PROJECTILE MOTIONApplicable if :
·
no air friction -> free fall-motion upwards or downwards in the earth's gravitational field when no other
·
one dimension forces act on the
object
·
close to surface of earth
(use equations of motion)
For free falling bodies ->
acceleration due to
gravity
=
the same for all masses
(gravitational acceleration =
g
=
9 , 8 m Sh.
downwards)
: 9 8 m st downwards
a is always ,
.
ALWAYS :
When pick ref frame
calculating
·
:
remember
.
,
a = 9 .8 m . S downwards
·
draw FULL MOTION in
pencil
⑧
·
fell from rest ->u=0 ↓ ⑧
draw arrow
you're working with in
pen
·
v
highest point (T P) 0 v
at 1 .
=
·
data list
·
if moving up then falls --arrow goes +
up then down
f
↓
·
time to reach a
height-time to fall back to same height
for
any height , upwards v= downwards v in
magnitude
of
·
if an
object hits the
ground at constant. : split up-b-f +
4
if projected from
not
given height of starting point height=xm the point it
·
- max above was
I
RELATIVE VELOCITY
* NB* Equations of motion can
only be used with velocities RELATIVE TO THE GROUND
To calculate :
-
Visto ground- VA to ground
=
V * ORDER IS
B relative to A NB *
--
AVERAGE US INSTANTANTANEOUS VELOCITIES
Time between dots , frames alphabet letters etc.. ,
Time between is
always constant !!!
·
Will rate per second, must calculate time between
give each
·
upper above
e
.
g . L drops in Is
lower' drop in s
=
Average velocity (V) Instantaneous
:
velocity (VIU)
:
SUBSCRIPTEleimeframes
·
PUT ·
subscript of letter/time/frame
Calso for ( x +
XE)
·
inst . v =
~ in the middle of the time
=L
-
-
Vas=Vis-los
·
if need one , and have V but
an
average no
Acceleration :
point in middle of time
-o put your own letter (x)
·
ONLY instantaneous velocities !! in the middle of the time of the
a = sub in
symbols w/subscripts ,
then values
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