Rotational Dynamics

Moment of Inertia Disk


<div class="wp-block-create-block-problemblock">A solid disk of unknown mass and known radius R is used as a pulley in a lab experiment as shown below.  A small block of mass m is attached to a string, the other end of which is attached to the pulley and wrapped around it several times.  The block of mass m is released from rest and takes a time t to fall the distance D to the floor.<br /><img src=/old/images/rotationalinertia2.gif alt="physics rotational inertia problem ><br />A. Calculate the linear acceleration ##a## of the falling block in terms of the given quantities.<br />B. The time t is measured for various heights D and the data are recorded in the following table.<br /><img " src="/old/images/accelerationphysics.gif"  alt="physics rotational acceleration problem ><ul><li>What quantities should be graphed in order to determine the acceleration of the block?  Explain your reasoning.</li><li>Plot the quantities determined in (B)i, label the axes and draw the best fit line to the data.</li><li>Use your graph to calculate the magnitude of the acceleration.</li></ul><br />C.  Calculate the rotational inertia of the pulley in terms of m, R, ##a##, and fundamental constants.<br">D. The value of acceleration found in (B)iii, along with numerical values for the given quantities and your answer to (C), can be used to determine the rotational inertia of the pulley.  The pulley is removed from its support and its rotational inertia is found to be greater than this value.  Give one explanation for this discrepancy.</div>


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