19/04/2010 (Day 3)

WELCOMEhttp://plkclscmc-timothy.viviti.com/

Experiment 6.13 (P.142)

1. •Find out its mass

2. •Find out its volume

3. •Calculate its density

Experiment 6.13 (P.142)

If I measure the volume of a floating object, what can I do?

Experiment 6.13 (P.142)

- Block: Iron, Aluminium, Cork 1/each

- Measuring Cylinder 1- Electronic Balance 1- Thread 3

Experiment 6.13 (P.142)

Precautions- To lie down the measuring

cylinder in the box.

- To tie the blocks tightly.

Experiment 6.13 (P.142)

1. •Find out its mass

2. •Find out its volume

3. •Calculate its density

TIME: 20MINS

Experiment 6.13 (P.142)Object Mass(g) volume density

Iron

Aluminium

Cork

Experiment 6.13 (P.142)

3. Arrange the objects in ascending order of density.

__________________________Cork, Aluminium, Iron

Sinking and floating (P.144)

An object floats or sinks depends on its density.

Activity Corner C (P.144)1(a)Polystyrene,

oil and ice are above the water layer.

Activity Corner C (P.144)1(b)

These substances are floating on water because they are _____________ than water.

less dense

Activity Corner C (P.144)2(a)

Ice, water, iron nail and mercury are below the water layer.

Activity Corner C (P.144)2(b) These substances sink

below oil because they are _____________ than oil.denser

Activity Corner C (P.144)

3. Polystyrene, oil, ice, water, iron nail, mercury.

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

Particle models and density (P.146)

Mass of particles

Particle models and density (P.146)

Packing of particles

SPECIAL QUESTION(P.145)Why do metal ships

float?

Experiment 6.14 (P.142)

Making a hot air balloon

Experiment 6.14 (P.142)2. Light the Bunsen burner.

What happens to the plastic bag?

_________________The plastic bag rises

Experiment 6.14 (P.142)

Making a hot air balloon

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

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

Experiment 6.14 (P.142)3. Hot air balloons can

rise because the density of air inside is smaller than that outside.

HOMEWORKExperiment 6.13