Dunia Sains Dan Teknologi KSSR Tahun 1
Teknologi Maklumat Sekolah Rendah KRT 3013
Sabtu, 17 Disember 2011
Khamis, 15 Disember 2011
DST KSSR
Floating & Sinking Experiment
Diver in a Bottle
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Steps:
1. Make a plasticine (modelling clay) figure 3.5cm (1.25in) long. Fix the paper-clip to its head and hang it from the pen top. Fill the bottle with water and drop in the scuba diver.
2. The pen top should float with its top just above the water level. Make the figure bigger or smaller if needed. Then pour in more water and screw the top on tightly.
Why the diver rises and sinks:
2. The pen top should float with its top just above the water level. Make the figure bigger or smaller if needed. Then pour in more water and screw the top on tightly.
Why the diver rises and sinks:
When you put the pen top in the water, a bubble of air is trapped inside it. This trapped air bubble makes the diver less dense than water, so it floats. When you squeeze the bottle, water squashes the air and takes up more space in the pen top. Now the diver is denser than water, so it sinks. When you relax your grip on the bottle, the air in the pen top expands again. Now the diver is less dense than water, so it comes back up to the surface.
Rabu, 14 Disember 2011
Selasa, 6 Disember 2011
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