19/04/2010 (day 3) welcome
DESCRIPTION
Experiment 6.13 (P.142) If I measure the volume of a floating object, what can I do?TRANSCRIPT
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19/04/2010 (Day 3)
WELCOMEhttp://plkclscmc-timothy.viviti.com/
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Experiment 6.13 (P.142)
1. •Find out its mass
2. •Find out its volume
3. •Calculate its density
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Experiment 6.13 (P.142)
If I measure the volume of a floating object, what can I do?
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Experiment 6.13 (P.142)
- Block: Iron, Aluminium, Cork 1/each
- Measuring Cylinder 1- Electronic Balance 1- Thread 3
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Experiment 6.13 (P.142)
Precautions- To lie down the measuring
cylinder in the box.
- To tie the blocks tightly.
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Experiment 6.13 (P.142)
1. •Find out its mass
2. •Find out its volume
3. •Calculate its density
TIME: 20MINS
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Experiment 6.13 (P.142)Object Mass(g) volume density
Iron
Aluminium
Cork
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Experiment 6.13 (P.142)
3. Arrange the objects in ascending order of density.
__________________________Cork, Aluminium, Iron
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Sinking and floating (P.144)
An object floats or sinks depends on its density.
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Activity Corner C (P.144)1(a)Polystyrene,
oil and ice are above the water layer.
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Activity Corner C (P.144)1(b)
These substances are floating on water because they are _____________ than water.
less dense
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Activity Corner C (P.144)2(a)
Ice, water, iron nail and mercury are below the water layer.
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Activity Corner C (P.144)2(b) These substances sink
below oil because they are _____________ than oil.denser
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Activity Corner C (P.144)
3. Polystyrene, oil, ice, water, iron nail, mercury.
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Activity Corner C (P.144)If an object is denser than a liquid it ___________ the liquid. If an object is less dense than a liquid, it ___________ the liquid.
sinks on
floats on
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Particle models and density (P.146)
Mass of particles
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Particle models and density (P.146)
Packing of particles
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SPECIAL QUESTION(P.145)Why do metal ships
float?
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Experiment 6.14 (P.142)
Making a hot air balloon
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Experiment 6.14 (P.142)2. Light the Bunsen burner.
What happens to the plastic bag?
_________________The plastic bag rises
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Experiment 6.14 (P.142)
Making a hot air balloon
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Experiment 6.14 (P.142)2.(a)The movement of air
particles inside the bag becomes _________.faster2.
(b) The air particles inside the bag move _____________.
further apart
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Experiment 6.14 (P.142)2.(c)The density of air inside
the bag _________.decreases
2.(d) The density of air inside
the bag is _________ than that of the air outside.
lower
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Experiment 6.14 (P.142)3. Hot air balloons can
rise because the density of air inside is smaller than that outside.
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HOMEWORKExperiment 6.13