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3
SIMULATIONS :
http://hypertextbook.com
/physics/mechanics/displacement/
(distance & displacement)
http://regentsprep.org/Regents/physics/phys
(distance & displacement – ant)
4
 A car is moving towards North
 A snake is crawling
 Speed limit on the
highway in Malaysia
is 110 kmh-1
 An athlete is moving
towards the checkpoint
at a velocity of 25 ms-1
5
DIFFERENCES BETWEEN
DISTANCE & DISPLACEMENT
B
A
6
B
distance
displacement
A
7
DISTANCE AND DISPLACEMENT
 Total length travelled from point A to
point B
 Total distance travelled in a specified
direction
A
B
8
DISTANCE
 The total path length travelled from
one location to another
 Scalar quantity
 SI unit : m
9
DISPLACEMENT
 The distance between two location
measured along the shortest path
connecting them in a specified
direction
 Vector quantity
 SI unit : m
10
SPEED & vELoCITy
11
SPEED
 The rate of change of distance
Average speed = total distance travelled, s
time, t
 Scalar quantity
 SI unit : ms-1
12
 The rate of change of
displacement
Average velocity = total displacement , s
time, t
 Vector quantity
 SI unit : ms-1
vELoCITy
13
ISTANTANEoUS SPEED :
 The speed at any instant
ISTANTANEoUS vELoCITy :
 The velocity at any instant
14
http://www.glenbrook.k12.il.us/gbssci/phys/m
(average speed)
15
APPLICATIoN :
16
QUESTIoN 1 :
A cow moves 3 m to the East and the
4 m to the North. Find the :
(a) Total distance moved by the cow
(b) Displacement of the cow
17
North East
West East
North
South
South East
North West
South West
DIRECTION
18
ANSWER 1 :
A B
C
3 m
4 m
(a)The total distance moved by the
cow
= 3 m + 4 m
= 7 m
(b) Displacement of the cow
= √32
+ 42
= 5 m due to North East
19
QUESTION 2 :
O A
B
Figure shows the path travelled by a
cyclist. He started his journey from
O, moved a distance of 150 m to
East towards A and then moved a
distance of 200 m to North towards
B. The cyclist took about 25 s to
complete his journey. Determine :
(a) The total distance travelled
(b) The displacement from O
(c) The average speed of the cyclist
(d) The average velocity of the cyclist
150 m
200 m
20
O A
B
150 m
200 m
ANSWERS 2 :
21
(a) Total distance travelled
= 150 m + 200 m
= 350 m
(b) Displacement
= √1502
+ 2002
= 250 m due North East
22
(c) Average speed
= 350 m
25 s
= 14 ms-1
(d) Average velocity
= 250 m
25 s
= 10 ms-1
23
REFLECTION / CLOSURE
(EVALUATION)
24
DIFFERENCES BETWEEN
DISTANCE & DISPLACEMENT :
DISTANCE DISPLACEMENT
The total path length
travelled from one
location to another
The distance between
two location measured
along the shortest path
connecting them in a
specified direction
Scalar quantity Vector quantity
SI unit : metre SI unit : metre
25
DIFFERENCES BETWEEN
SpEED & vEloCITy :
SPEED VELOCITY
The rate of change of
distance
The rate of change of
displacement
Scalar quantity Vector quantity
Average speed
= total distance travelled, s
time, t
Average velocity
= total displacement , s
time, t
SI unit : ms-1
SI unit :ms-1

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SPEED & VELOCITY