GRADE 11 IEB PHYSICAL SCIENCE SUMMARY

KINEMATICS
kinematics




I

, dplinvp

Mathematical relationships : dsp lisp ] + UP "


Up
-



v
Str eine =
VAI
INC
-0
Can use variables such as R/V/l y
n V l
Both INC
'



0,5
INC Z . -




4 I X3
X3
G l S
const
-




t z -
.

directly prop * a :-O ,s=4 14 1=4


Y xx x Ky
-




; eq
-




y
'

I
.
.

K -
-


9
y x
x y
% -




X X
(
Z O 's
Ip lb
i. :
)÷z
mint 4 0,25
2 inverse * y Mato Y'
prop
-

6
0,17
.
-




[ Xz ik
Gradient x

txjxy
x
Y /
,
L 2×0,5=1
K 4×0,25
-
-




Y ( Y A hyperbola ! .
'




.

change to 7

X Ya




dp ip dsp isp
y
YPE Linear rel parabolic hyperbolic
hyperbolic re , rel . R .




Test ¥=K ¥ -
K x2=K
¥ ,
=p,



inv p to
y
is dp to x
y is inv prop tox y isdptothe square y is

Statement of x the square of
x




symbols :
y xx
y Lst Loi
y
hot
expression y


Equations y=kx y
=
¥ y
- Koe
y
-
I
22

, Forces :



a force is a physical interaction between 2 bodies that
may change the motion of the object .
(push or pull)
effects :
start moving speed down ; shape size ; to rotate
; up ; slow change ; change cause
obj
* Si unit =
Newtons measured with
spring balance or force meter .




Contact / mechanical vs non -

contact free body diagrams :

C
applied force gravitational
- .




. =
-

friction electrostatic i. e. A- & B =
, a
E •

. I B
& D &
-


normal force magnetic =
C =
opp

.


E
-


tension nuclear D
=
smaller

compression
-




* Balanced force keep
-
elastic force :
objects stationary .




* Unbalanced forces
buoyant force : movement
-

cause .




)
( flotation)




Resultant force Cnet Force )




Fnet speed
o acceleration object is at rest constant
=
O or
-
-
- - .




Fnet O
object Speeding slowing down
'




acceleration o is . .

up or .




Gravitational force




in NB ! S1 unit convert !
def the of matter object kg
'
: amount
=
mass = an . .




def :
weight =
the
gravitational force of the Earth on an object ,
on / near its surface .
Cfg =
m . 9. 8)



Normal force :




force exerted object that is in contact with @ 90 to surface
'




surface
'




def : the perpendicular by a on an it .
. .
.




*
magnitude depends other forces * W M
g w N i
can workout w using the weight formula
-


on -
- -
-
. .




Frictional force



def :
the force that opposes the motion of an
object d acts parallel to surface with which it is in contact


Types fluid resistance * Factors Normal Force El material
'




friction ; friction drag)
: air surface
dry and ( .

.