Class notes
All of IGCSE Edexcel 9-1 Physics
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Clear and concise notes of all of IGCSE Edexcel 9-1 Physics. All topics from two years of the programme.
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Forces and MotionUnit Conversion
Quantity Unit
1
. 20m >
-
Ft
1ft
↑
Mass Kilogram
20m = 20 +
0 308 .
=08ft = 64 9 +t .
Time Second
.
2 5m/s >
km/h Length Meter
Time Hour
5m =
3600 1000
km
m
=
18000
1000
I 18 I
n Speed km/h
Volume m2
.3 g
8 OZ
3
. to
cm3 cm3
8 .
39 28 39
02
(2 5433 136 .
0126
4
8
.
X + = = .
cm3
.
in 3 28 3 .
4 . 0 13 m2
. to ft2
Im
0 13m2 = 0 . 13 + = 1 3975 t
10 305/2
. .
.
Performing Calculations with Units
z
2m/S
>
75km/h
time time
L
-
V 30 seconds
S u+
+ ↓ E
29
=
M 1
1
initial
acceleration
velocity
displacement
.
1 Change the units into formula
2
Plug
S =
20 +
305 +
2 +
25 130s)
+
75km 1000m 1 hour 75000m
20m/s
X = =
X
n 1km 3600S 3600S = 600m + + 9005
= 600m + 900m
= 1500m
, .1
1 Speed and Velocity
Average Speed
Example :
A train travels 440km in 3 hours
· Calculate
is
average speed in m/S
.
moved
average speed-distance time taken
s = S= 41m/s
7
440 x 1000
S =
3 x 3600
Displacement vs
. Distance
·
Distance -
cannot be negative ,
always increases
Im
2 > · total =
7m
·
1m 1m
1 m
2m
3 m
Displacement be negative
· -
can
im away
- 1m
< · 7
&
-
1m 1m 1m
1m
1m
Speed vs
. Velocity
·
Velocity is a speed in a defined direction
·
Speed is a time rate at which an object is
moving
Distance - Time Graphs
40
-
·
Gradient of
graph-speed
I
·
·
Calculate distance
38-
20m
E a) after 10 seconds
6) from the interal of 10s to 15s
!
20
55
20m
6)
10 -
s
20m
a) S 4 m/s
=
=
gs
10S
' is is
-
28 =
2ms
time in
S
, Instantaneo Velocity
·
If the gradient gets steeper
,
↑
the speed is increasing ,
biker
-
200 is
accelerating
E
-
150
:
Bo
108 - · To calculate instantances velocity
· &
I
(velocity at
any point)
50
-
* 175m
I
> we need to draw tangent
255
" line
id zo · do
time in S
S
=
S =
75m
= 3m/s
255
Average Velocity
#x
-
Dy
-
1x
displacement
Velocity =
time taken
By
>
time
Displacment-time graphs
Gradient-velocity
1
-
I
not moving
·
ng awe
the
not moving
velocity
movi
constant
Icate
n
=
moving
>
time
, . 2
1 Acceleration
Speeding up and slowing down
accelerating -
speeding up decelerating -
slowing down
Acceleration
=
change in
velocity Unit =
#
time ga
-v v -
U
Acceleration = I
* t t
Example : A car
sped up to 12 5 .
m/s in 5 s what is its acceleration ?
,
12 5-0
acceleration of
.
m/s2
=
car = 2 5 .
S
Velocity -
Time Graphs
-
3-
constant
T speed B
-2- ⑧
- ac elerates decelerates
I >
I
3"'s's g lo
1 to 0
2 closer
Goes
back going back
Time in S
6ack goesslower faster farther
↑ ,
C
from O slower
of
·
gradient graph shows acceleration
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