DATA LOGGER: PRESSURE

GROUP 7:Azlin Binti Ahmad Kamaruzzaman M20121000026Nor Hafiza Binti Isa M20131000611Nurul Jannah Binti Amirul M20122001592Rozaireen Binti Badrulzaman M20131000621Siti Norafizan Binti Jalaluddin M20131000664Nurashikin Binti Muzafar M20131000660

Small Small

give give moremore!!!!

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?

ENGAGE

Answer:

Small give more!!

EMPOWER

Procedure: 1. Arrange the apparatus as shown in the diagram.

RubberTube

Syringe(20 ml)

Sensor

Syringe(10 ml)

Graph time(s) against pressure (kPa) for 10 ml syringe

RESULTS

Graph time(s) against absolute pressure (kPa) for 20 ml syringe

RESULTS

Table 1: Pressure (kPa) for 10 ml syringe

RESULTS

Table 2: Pressure (kPa) for 10 ml syringe

RESULTS

10 ml syringe 20 ml syringeTime

(seconds)Pressure

P= F/A (kPa)Time

(seconds)Pressure

P= F/A (kPa)1 112.75 1 102.872 119.44 2 111.823 124.00 3 115.434 128.62 4 124.015 134.81 5 127.456 138.93 6 131.477 146.42 7 134.838 150.23 8 137.459 159.85 9 140.2810 166.81 10 145.3611 175.74 11 148.8212 180.17 12 149.4313 188.26 13 152.61

Table 3: Comparison between pressure (kPa) for 10 ml and 20 ml syringe

RESULTS

Table 4: Comparison between mean of pressures (kPa) for 10 ml and 20 ml syringe

Readings (R)Mean (Pressure, kPa)

10 ml 20 ml

R1 199.57 195.95R2 155.72 149.64R3 171.52 170.79

RESULTS

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.

DISCUSSION

Questions

QuestionsQ: 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.

DISCUSSION

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?

ANSWER