Title:
Density of Wood Blocks
Purpose:
To determine the density of a set of wooden blocks.
 To practice
metric measurement
 To calculate
using metric units
 To organize
and graph data
 To determine
density via direct calculate and by graphing
 To practice
determining slope from a graph
 To calculate
percent error
Materials:
 •set of wooden
blocks
 •metric ruler
 •balance
 •graph paper
Procedure:
 Measure length,
width, and height of each block (to nearest .01 cm)
 Determine
mass of each block using balance (to nearest .01 g)
 Calculate
volume (V = l x w x h) of each block
 Determine
mean volume
 Calculate
density (D = m/V) for each block
 Determine
mean density for all wood blocks (this is the calculated value)
 Graph volume
(xaxis) vs mass (yaxis)
 Draw a "line
of best fit"
 Determine
slope of this line ( y_{2 } y_{1}/
x_{2 } x_{1}) (Use
triangle method.....teacher will demonstrate)
 Compare calculated
value for density with that from the slope determined by triangle
method.
 Calculate
percent error 3 ways:
(A  O/ A) x 100%
 using calculated
value as "actual value" (A) and slope determined by triangle
method as "observed value" (O),
 using value
provided by teacher as actual value and calculated value as
observed value
 using value
provided by teacher as actual value and slope determined by
triangle method as observed value
Results:
(Observations and data~~~data charts and graphs and calculations
where appropriate. Organization is necessary)
 data chart for
measurements
 data chart for
calculations
 graph of mass
vs volume
 percent error
calculations
Discussion:
 Briefly summarize
what you did.
 Comment on measurement
problems
 Compare calculated
and graphically determined slope values
 Restate percent
error
 Comment on precision
and accuracy of your measurements (remember the definitions of these
terms!)
 Comment on possible
sources of error
Conclusion:
(A one sentence testable statement that follows from your
results, what you did, what you observed)
The easiest
conclusion to make from this lab is the wood density value.
Reflection:
 (A personal
statement about the activity, whether it relates to "real life," whether
you liked it, suggested improvements.....)
