Page 83 - Physics Form 5 KSSM_Neat

Activity 2.11 STEM ISS CHAPTER 2

Aim: To construct a Cartesian diver to show the working principle of ballast tanks in a submarine Pressure
Apparatus: 1.5 litre plastic bottle and a test tube that can be inserted into the plastic bottle
Materials: Masking tape, water and food colouring
KEMENTERIAN PENDIDIKAN MALAYSIA
Instructions:
1. Prepare the apparatus as shown in Figure 2.35(a).
2. Fill the test tube with water until it is three quarter full. Invert the test tube and quickly put
it inside the plastic bottle. The test tube should float on the surface of the water as shown in
Figure 2.35(b).

Trapped air
Bottle filled with
coloured water
Test tube

Test tube

Masking tape
(a) (b)
Figure 2.35
3. Observe the level of water in the test tube.
4. Squeeze the lower part of the bottle so that the test tube sinks slowly to the base of the bottle.
Observe the level of water in the test tube.
5. Slowly release the pressure on the bottle so that the test tube moves up again to the surface of
the water. Observe the change in the level of water in the test tube.

Discussion:
1. (a) Compare the level of water in the test tube when the test tube is floating on the surface and
when it sinks to the base of the bottle.
(b) Compare the volume of water in the test tube when it is floating on the surface and when it
sinks to the base of the bottle.
SCAN ME
2. How does the volume of air in the test tube change when the SCAN ME
test tube moves up from the base of the bottle to the surface Video of a
of the water? Cartesian diver
3. Explain the movement of the test tube by applying http://bit.ly/2uwbnbS
Archimedes' principle.

LS 2.5.3 73