Page 76 - Physics Form 5 KSSM_Neat

2.5 Archimedes’ Principle

Buoyant Force My Glorious
Photograph 2.7 shows two pieces of plasticine, P and Q with the Malaysia
same mass. When the two pieces of plasticine are placed in a Tengku Tengah Zaharah Mosque
KEMENTERIAN PENDIDIKAN MALAYSIA
container with water, plasticine P sinks while plasticine Q floats at Teluk Ibai, Terengganu is the
on the surface of the water. How does this situation occur? first floating mosque in Malaysia.
This mosque is built on a floating
platform at the estuary of a river
Side view: Top view: and can accommodate up to
2 000 worshippers. The buoyant
Plasticine Q Plasticine P force produced by the water
around the platform supports the
weight of the mosque.

Plasticine P

Plasticine Q

Photograph 2.7 Plasticine in a container of water

Activity 2.9

Aim: To discuss the buoyant force on an object immersed in a liquid

Instructions:
1. Carry out this activity in pairs.
2. Study Figure 2.27 that shows a cylinder
submerged in a liquid.
3. Compare the depth of the top surface and the
h
depth of the bottom surface of the cylinder. 1
4. Compare the liquid pressure on the top surface Top surface
h of cylinder
with the liquid pressure on the bottom surface of 2
the cylinder.
5. Compare the magnitude on the force on the
top surface with the magnitude of the force on
the bottom surface on the cylinder caused by Bottom
the liquid pressure. surface
6. What is the direction of the resultant force acting of cylinder
on the cylinder as a result of the difference in Figure 2.27
liquid pressure?

66 LS 2.5.1