3. ENGAGE
Ali uses two different
sizes of nails to work on
his Kemahiran Hidup
project. He realizes that,
when he uses bigger size
of nails, he needs to hit
the nail harder,
compared when he uses
smaller size of nail.
From your knowledge,
what is the explanation
for this situation?
12. RESULTS
Table 3: Comparison between pressure
(kPa) for 10 ml and 20 ml syringe
10 ml syringe
Time
Pressure
(seconds)
P= F/A (kPa)
1
112.75
2
119.44
3
124.00
4
128.62
5
134.81
6
138.93
7
146.42
8
150.23
9
159.85
10
166.81
11
175.74
12
180.17
13
188.26
20 ml syringe
Time
Pressure
(seconds)
P= F/A (kPa)
1
102.87
2
111.82
3
115.43
4
124.01
5
127.45
6
131.47
7
134.83
8
137.45
9
140.28
10
145.36
11
148.82
12
149.43
13
152.61
13. RESULTS
Table 4: Comparison between mean of
pressures (kPa) for 10 ml and 20 ml syringe
Readings (R)
R1
R2
R3
Mean (Pressure, kPa)
10 ml
20 ml
199.57
155.72
171.52
195.95
149.64
170.79
14. DISCUSSION
Questions
Q: Compare the air pressure exerted on the 10 ml of
syringe and 20 ml of syringe.
A: The pressure exerted on 10 ml syringe is greater than
20 ml syringe. For example, the value of pressure for
10 ml syringe at 13 s is 188.266 kPa compared to 20
ml syringe is 152.61 kPa.
15. DISCUSSION
Questions
Q: Based on the results from the tables and
graphs above, explain the relationship
between the surface area and the pressure
exerted?
A: The value of pressure (kPa) is influenced by the
surface area. Smaller size of syringe (10 ml)
exerts greater pressure compared to bigger size
of syringe (20 ml). As a conclusion, the smaller
the surface area, the greater the value of pressure
exerted.
16. ENHANCE
Amna carries her back pack when she goes
shopping, after a while, she feels her shoulder hurts.
However, when she carries her school bag even for
a longer period of time, her shoulder does not hurt.
What is the explanation for this situation?
