Page 36 - text book form physics kssm 2020

Distance travelled
(c) Speed =
Time taken
17 m
=
15 s
= 1.13 m s –1
Displacement
(d) Velocity =
Time taken
13 m
=
15 s
–1
= 0.87 m s (in the direction of OB)

C C Co
Contoh 3ntoh 3ntoh 3ntoh 3ntoh 3ntoh 3ntoh 3ntoh 3ntoh 3
Example 3
C C Co
Co
Co
C Co
C C Co
C Co
Co
After landing on the runway, a plane slows down so that File
–1
–1
its velocity reduces from 75 m s to 5 m s in 20 s. What
is the acceleration of the plane? Deceleration is a condition in
Solution: which the velocity of motion of
an object is decreasing.
–1
–1
Initial velocity, u = 75 m s , final velocity, v = 5 m s ,
time, t = 20 s
v – u
Acceleration, a =
t
5 – 75
=
20
= –3.5 m s –2
A ticker timer fitted with ticker tape as shown in Figure 2.8 is used to investigate linear
motion of objects in the laboratory.

Vibrating plate
A ticker timer works on alternating current of
Connected to an frequency 50 Hz to make 50 ticks in 1 second
alternating current on a ticker tape.
power supply
The time interval between two adjacent dots is
called one tick.
1
Therefore, 1 tick: s = 0.02 s
Ticker tape 50
Carbon 5 ticks: 5 × 0.02 s = 0.10 s
paper
10 ticks: 10 × 0.02 s = 0.2 s
Pulled by moving object

Figure 2.8 Ticker timer with ticker tape

30 2.1.2
30
2.1.2