This laboratory work details an experiment to determine the coefficient of dry sliding friction between a wooden block and a wooden surface using a coupled body system. The experiment involves measuring the motion of a falling weight connected to the block to derive the friction coefficient.
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The purpose of this laboratory work is to
determine the coefficient of dry friction of
sliding a wooden block on a
wooden surface in a system of coupled
bodies. The system of coupled bodies
used in this work
consists of a wooden block and a
weight connected by a thread thrown
over a fixed block. The block is installed
on a wooden horizontal surface and
the load is suspended so that it can
move vertically in the direction of the floor
or other support. Therefore, to perform
the work, you will need the following equipment:
ruler, scales, stopwatch, wooden
surface, fixed block, wooden
block, set of weights, strong thread. The successful
conduct of the experiment depends on the
correct construction of the mathematical model
and obtaining the expressions necessary for the calculation.
Therefore, the first thing to do is to construct a
drawing for this model and indicate the forces
that will act in the coupled system of bodies.
Then, using the formula for
calculating the displacement, prove that when
the block starts moving under the action of the weight, the
acceleration of their motion can be determined by the
acceleration form equal to 2h by t², where h
is the height of the edge. weight above the surface and
t - the time of movement of the weight before hitting
the surface write down the dynamic equations for
each of the table systems and neglecting
friction in the stationary block and its mass
Prove that the coefficient of friction of the bar on a
horizontal surface can be determined
by the expression МЮ = m2g - M1 +м2 * А родил
m1g where M1 is the mass of the bar and m2 is the mass of
mass of
the heavy let's move on to the stages of performing
the experiment at the beginning to enter the
results of measurements and calculations
prepare a table all measurements and
calculations will be immediately recorded in it
measure the mass of the
bar M1 and the mass of the weight
M2 with a scale install the bar on the edge of the
horizontal surface and select
the length of the thread so that the load that we
attach to it is above a
sufficient height conduct a trial
experiment and make sure that at the
ratio of the masses of the bar and the weight
the system starts moving if
necessary load the bar or
select another weight in our
experiment it was optimal to load
the bar, increasing its mass by 30 g,
holding the bar, measure the distance H
from the lower edge of the weight to the base at the
moment the bar is released, turn on the
stopwatch and measure the time T of its movement
until it collides with the base, without changing the
initial position of the connected bodies,
repeat the experiment three more
times, proceed to the processing of the
experimental results, calculate the average time of the
weight's movement as the
arithmetic mean using the formula 1, determine the
average acceleration of the weight's movement
using the formula 2, determine the average value of
the coefficient of
sliding friction, estimate the relative error
of the experiment by comparing the value of
the coefficient of sliding friction of a tree on a
tree obtained during the experiment with the tabular
tabular
value, use the
expression at the end, formulate a conclusion, having
analyzed the experiment and its
result, analyze the experiment and
its result in the conclusion, indicate the first
value that you measured, the second
measurement result, the third - the reasons for
the error, a creative task, write down a plan for
conducting an experiment to determine the
acceleration of free fall
using the setup presented in
If possible, conduct an experiment in the photo.
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