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Physics paper 1
Practicals
P3- density
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Cards (12)
Calculating
the density of a regularly shaped object
1. Measure the
dimensions
of the regular shape and calculate the
volume
2. Measure the
mass
of the shape using a
calibrated
balance
3. Calculate density from the
mass
and
volume
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Volume of a
prism
Area of
face
x
height
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Volume of a rectangular prism
Length x
Width
x
Height
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Volume
of a sphere
4/3
x π x radius³
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Equation to calculate density
Density
=
Mass
/ Volume
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Measuring
the object's mass
1. Use a
digital balance
2.
Zero
the
balance
before placing the object on it to avoid a zero error
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Converting density from g/cm³ to kg/m³
Multiply
the value by
1000
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Calculating
the density of an irregularly shaped object
1. Measure the
mass
of the irregular shape
2. Fill a
displacement
can with water and submerge the object
3. Record the
volume
of water that has been displaced
4. Calculate the
density
from the mass and volume
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Collecting the displaced water
Place a measuring beaker under the can spout
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Filling the displacement can
Fill the can until water starts to drip out of the spout and into the
beaker
, then wait until the dripping just stops before
submerging
the object
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Calculating the density of a liquid
1. Measure the
mass
of the empty measuring cylinder
2. Pour around
100cm³
of liquid into the cylinder and record the
volume
3. Measure the
mass
of the cylinder with liquid in, and subtract the cylinder's
mass
to calculate the mass of liquid
4. Calculate
density
from mass and
volume
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In general,
solids
are more
dense
than liquids since their particles are more tightly packed together meaning there is more mass per unit volume
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